Suresh Eringathodi

• M.Sc., Ph.D
• Principal Investigator at Central Salt and Marine Chemicals Research Institute

The novel synthetic amino acid-like zwitterion containing imine bond ionic compound 2-[(E)-(2-carboxy benzylidene) amino] ethan ammonium salt, C10H12N2O2, was synthesized. Computational functional characterization is now being used to predict novel compounds. Here, we report on a titled combination that has been crystallizing in orthorhombic space...

Two isostructural MOFs {[Cd(BDC)(L)] ⋅ CH3OH}n (1) and {[Cd(NH2‐BDC)(L)] ⋅ CH3OH}n (1‐NH2) involving Cd metal center and different dicarboxylate ligands (1,4‐benzenedicarboxylate (BDC) in 1 and 2‐amino‐1,4‐benzenedicarboxylate (NH2‐BDC) in 1‐NH2) and a common amide functionalized N‐donor ligand ((E)‐N′‐(pyridin‐3‐ylmethylene)nicotinohydrazide (L))...

Uranium extraction from seawater (UES) efficiency is limited by the material design, such as U-selective binding sites, their uniform distribution, surface area exposure, diffusivity, and stability. Herein, we report a U-selective single-component hydrogen-bonded organic framework (CSMCRIHOF-1) of phenoxy-imine synthons conjugated to pyridyl tecton...

Base assisted divergent reactivity of isatins and allenoates has been achieved, which afforded diastereoselective spirofuran oxindoles and γ-functionalized allenoates. DBU mediated Morita-Baylis-Hillman (MBH) reaction followed by the cascade annulation through the stabilized β-ammonium enolate intermediate led to the spiro-framework. Wherein the DA...

Novel six Ni(II) complexes of an NNS donor 2-benzoylpyridine-N⁴-methyl-3- thiosemicarbazone(HL) are synthesized and characterized. Various physicochemical techniques are applied for the study of the coordination behavior of the thiosemicarbazone to the nickel center. In all the complexes, thiosemicarbazone is coordinated in the thiolate form. A fou...

AlCl3‐Catalyzed oxidative cyclization of thiosemicarbazones / triazolothiones with propargylic alcohols is achieved by providing a diverse set of triazolothiazines in good yields. Triazolothiazines were synthesized in a shorter duration at room temperature under an open‐air environment with atom economical approach. image

New mononuclear complex [NiLβ-pic] has been synthesized by the reaction of Ni(II) acetate with salicylaldehyde 3-azacyclothiosemicarbazide (H2L) in the presence heterocyclic base, β-picoline as an auxiliary ligand. The complex has been investigated by elemental analysis, FT-IR, UV-Vis, ¹H NMR and ¹³C NMR spectroscopy. These data show that the thios...

A series of non-heme μ-oxo-bridged dinuclear iron(iii) complexes of the type [Fe2(μ-O)(L1-L6)2Cl2]Cl21-6 have been isolated and their catalytic activity towards oxidative transformation of alkanes into alcohols has been studied using m-choloroperbenzoic acid (m-CPBA) as an oxidant. All the complexes were characterized by CHN, electrochemical, and U...

The development of high-efficiency and durable bifunctional electrocatalysts is an important and challenging topic in the area of energy storage/conversion. Herein, we prepared metallic cobalt nanoparticle decorated N-doped graphitic sheets (Co@NGr) by adopting facile pyrolysis of a mixed ligand cobalt-based MOF (CoMOF-2) as a sacrificial template...

Controlling the product selectivity of a ring-opening hydrolysis reaction remains a great challenge with mineral acids and to an extent with homogeneous catalysts. In addition, even trace amounts of metal impurities in a bioactive product hinder the reaction progress. This has necessitated the development of robust and metal-free catalysts to offer...

An atom-economical and efficient route for the direct amidation and amination of aryl C-H bonds using our synthesized recyclable heterogeneous Cu-MnO catalyst is reported here. The direct C-H amidation was carried out using a simple amide without any preactivated coupling partner, and simple air was used as the sole oxidant. The reaction proceeds v...

The facile transformation of the functionalized spiro-cyclopentanones obtained by N-heterocyclic carbenes (NHC) catalyzed homoenolate annulation strategy, leading to the synthesis of indole embedded compounds is described.

Base assisted divergent reactivity of isatins and allenoates has been achieved, which afforded diastereoselective spirofuran oxindoles and γ-functionalized allenoates. DBU mediated Morita-Baylis-Hillman (MBH) reaction followed by the cascade annulation through the stabilized β-ammonium enolate intermediate led to the spiro-framework. Wherein the DA...

Crystalline two-dimensional organic nanosheets (2D-ONs) having atomic or near-atomic thickness with infinite lateral dimensions are of crucial significance for their possible application as a material for energy storage. The presence of nanofluidic channels with a designed array of molecular interlayers in such 2D-ONs, for a favorable lithium-ion t...

A calix[4]arene based compound incorporating amide and morpholine moieties has been synthesized and its ion recognition property towards metal ions and application of its metal complex towards sensing of amino acids has been investigated. The synthesized compound interacts with Cu2+ with high selectivity and sensitivity (LOD, 0.1 ppb) in aqueous me...

Environmental remediation, particularly in the context of water pollution, has been centrefold of a range of research domains for the past few decades. Metal organic frameworks (MOFs) or coordination polymers (CPs) are a relatively new class of infinite materials comprising metal nodes and linkers as repeat units. Exclusive merits of these material...

Dual ligand 3D MOF {[Co(BDC)(L)]·2H2O.xG}n (CoMOF-2; G = guest) was synthesized via simple room temperature stirring method. Bulk Phase purity of CoMOF-2 was assessed by various physicochemical methods including X‐ray diffraction (XRD). CO2 adsorption isotherms indicate that activated CoMOF-2 is efficient in CO2 uptake, which has been utilized for...

We synthesized two new adenine-based Zn(II)/Cd(II) metal-organic frameworks (MOFs), namely, [Zn2(H2O)(stdb)2(5H-Ade)(9H-Ade)2] n (PNU-21) and [Cd2(Hstdb)(stdb)(8H-Ade)(Ade)] n (PNU-22), containing auxiliary dicarboxylate ligand (stdb = 4,4'-stilbenedicarboxylate). Both MOFs were characterized by multiple analytical techniques such as single-crystal...

Synthesis of 2,6-disubstituted pyridines from pyridotriazoles through palladium-catalyzed aerobic oxidative denitrogenative reaction has been described. Denitrogenation of arylated pyridotriazoles generate metal-carbene intermediates in situ and provide selectively 6-aryl-2-benzoylpyridines. The same...

An efficient photocatalytic method was developed for the remote C5-H bond carboxylation of 8-amino quinoline amide and sulphonamide derivatives. This methodology uses in situ generated •CBr3 radical as carboxylation agent with alcohol and further extended to a variety of arenes and heteroarenes to synthesize the desired carboxylated product in mode...

The ligand L1 of 4-methyl-2,6-diformylphenol and L2 of 4-tert-butyl2,6-diformylphenol are synthesized through Schiff base condensation with rac-, (R)- (+), or (S)-(−)-1,1′-binaphthyl-2,2′-diamine (BNDA). As a result, the racemic L1 rac, L2 rac, and enantiopure L1 RR, L1 SS, L2 RR, and L2 SS ligands are obtained incorporating Cu(II) and Zn(II) salts...

Pyrido[1,2-a]indoles are known for medicinally and pharmaceutically important compounds; however, the efficient synthetic routes are scarce in the literature. We report herein a convenient and efficient route to synthesize these molecules through indium-catalyzed transannulation of pyridotriazoles with arenes. A library of compounds have been synth...

Mixed ligand three-dimensional neutral porous framework {[Co(OBA)(L)]·xG}n (CoMOF-1) (H2OBA = 4,4′-Oxybis(benzoic acid); L = (E)-N'-(pyridin-4-ylmethylene) isonicotinohydrazide; G = DMF, EtOH, MeOH, H2O) has been successfully synthesized by hydrothermal and reflux method. Activated MOF (CoMOF-1′) not only showed good affinity toward CO2 molecules,...

An expedient method was demonstrated for the synthesis of 3‐alkenyl‐3‐amino‐2‐oxindoles from readily available propargylic alcohols and isatin imines in the presence of BF3 ⋅ Et2O as a catalyst under open‐air atmosphere. The above reaction was time‐dependent and further extended to the one‐pot synthesis of highly substituted spiro‐indeneindolones v...

An efficient and highly regioselective Bi(III) catalyzed alcoholysis and Hydrochlorination reaction of spiro‐epoxy oxindole is demonstrated with alcohols and chlorine for easy access to 3,3‐disubstituted oxindoles. This protocol furnished alkyloxy and chlorinated products at the C3 spiro center of the epoxy ring in high yields upto 98% with excelle...

A series of mononuclear copper(II) complexes of the type [Cu(L)Cl2] 1–6, where L is a tridentate 3 N ligand such as N-methyl-N′-(pyrid-2-ylmethyl)ethylenediamine (L1), N-ethyl-N′-(pyrid-2-ylmethyl)ethylenediamine (L2), N-phenyl-N′-(pyrid-2-ylmethyl)ethylenediamine (L3), N,N-dimethyl-N′-(pyrid-2-ylmethyl)ethylenediamine (L4), N,N-diethyl-N′-(pyrid-2...

Dual ligand MOFs {[Zn(ADA)(L)]·2H2O}n (1), {[Cd(ADA)(L)]·2H2O}n (2) involving Zn(II)/Cd(II) metal centres and flexible 1,3-adamantanediacetic acid (H2ADA)/ pyridyl based Schiff base ligand, 4-pyridylcarboxaldehydeisonicotinoylhydrazone (L) as linkers have been efficiently synthesized including green mechanochemical methods and characterised by vari...

Light-emitting materials are of significant interest owing to their potential applications in electroluminescent devices/ displays and sensors. Herein, light-emitting metallogel systems are developed using self-assembled Ln(III)-complexes (Ln(III) = Eu(III) and Tb(III)) of 4′-p-fluorophenyl-2,2′:6′,2′′-terpyridine (L-F) and 4′-p-chlorophenyl-2,2′:6...

1,2,4-Trisubstituted-(1H)-imidazoles have been synthesized by the Cu(OTf)2- and I2-catalyzed unusual C–C bond cleavage of chalcones and benzylamines. After the α,β-unsaturated C–C bond cleavage, the β-portion is eliminated from the reaction. Various aryl- and heteroaryl-substituted chalcones and benzylamines were well tolerated in this unusual tran...

Two‐dimensional Zn(II)/Cd(II) based dual ligand Metal‐Organic Frameworks {[M(CHDC)(L)].H2O}n involving 4‐pyridyl carboxaldehyde isonicotinoylhydrazone (L) in combination with flexible 1,4‐cyclohexanedicarboxylic acid (H2CHDC) as linkers has been synthesized by adaptable synthetic protocols including green mechanochemical (grinding) method. Characte...

Zinc (II) based 3D mixed ligand metal organic framework (MOF) was synthesized by versatile routes including green mechanochemical synthesis. MOF {[Zn(ATA)(L).H2O]}n (ZnMOF-1-NH2) has been characterized by various physico-chemical techniques including SCXRD and composed of bipyridyl-based Schiff base, (E)-N′-(pyridin-4-ylmethylene)isonicotinohydrazid...

Mixed ligand 3D/2D Zn-MOFs {[Zn(BDC)(L1)].xG}n (ZnMOF-1) and {[Zn(IPA)(L2)]}n (ZnMOF-2) were synthesized using versatile synthetic routes including green mechanochemical (grinding) reaction. Chemical/ thermal stability, phase purity and characterization of both ZnMOFs synthesized by different approaches were established by various analytical method...

A series of intramolecularly hydrogen bonded zwitterionic compartmental ligands HL1‐HL4 containing a pendent diamine arm which is monoprotonated and an aldehyde functionality at two different ortho positions of a 4‐halophenoxide is reported herein. Single crystal X‐ray diffraction (SXRD) provides persuasive evidence for the identification of this c...

An unprecedented three component reaction involving arylidene oxazolone, enal and NHC, leading to the synthesis of fully substituted cyclopentanone derivatives with three contiguous stereocenters is reported. This reaction illustrates the...

The BF3•Et2O catalyzed reaction of nitrosobenzenes and an excess amount of propargylic alcohols was investigated to synthesize highly-substituted indole-3-carbinols. These reactions involve formal [3+2]-cycloaddition and the subsequent 1,3-rearrangement in a tandem manner via 3-alkylidene-3H-indole N-oxides. This methodology involves sequential add...

Dye capture and separation through coordination polymers (CPs) has been a promising research field in recent times due to the toxic and nondegradable nature of organic dyes released to the environment from various industries as well as the reusability of CPs for the said purpose. Here, we report the synthesis and characterization of two mixed ligan...

Zn(II)/Cd(II)-based dual ligand Luminescent Metal-Organic Frameworks (LMOFs) {[M(ATA)(L)]}n·xH2O (1) and (2) were synthesized by versatile synthetic routes, viz., diffusion of precursor solutions, conventional reflux, and green mechanochemical (grinding) reactions from bipyridyl-based Schiff base, (E)-N'-(pyridin-4-ylmethylene)isonicotinohydrazide...

Mechanochemistry provides a fast, convenient, clean, and atomefficient route to one-pot two-step synthesis of a series of copperspecific turn-on chemosensors (L1–L5), directly from solid reactants and without bulk solvents. Comparison of powder XRD, FTIR-ATR, and SEM data with the solution-route prepared compounds indicated mechanosynthesis of pure...

A simple, efficient, and general multicomponent reaction involving an enolizable ketone, a primary amine, and an N-protected 3-nitroindole was developed for the synthesis of a range of functionalized pyrrolo[3,2-b]indoles. The methodology was efficaciously utilized for the "pyrroloindoliztion" of natural products, the pyrrolization of 3-nitrobenzo[...

The luminescent lanthanide complexes EuL, TbL and its polymeric compounds EuL@PVA & TbL@PVA (where PVA = polyvinylalcohol) were synthesised. The complexes are soluble in water and depict their metal centred luminescence. The luminescent properties are meticulously monitored for sensing various nitro compounds in aqueous, polymeric, solid support an...

A number of calix[4]arene-based molecules were designed incorporating amide moiety with variation in conformation, rigidity at the binding sites and steric crowding at the upper rim to investigate the anion sensing property of this series of ionophores. These compounds were synthesised and characterised, molecular structures of two of the compounds...

An atom‐economical synthesis of 3‐alkylidene‐3 H ‐indole N ‐oxides has been developed via a tandem reaction of propargylic alcohols and nitrosobenzenes in the presence of boron trifluoride etherate (BF 3 ⋅Et 2 O) as catalyst. This method offers great potential for the synthesis of biologically important 3‐alkylidene‐3 H ‐indole N ‐oxides and relate...

Two cadmium(II) coordination polymers (CPs) of compositions {[Cd(H2O)4(4-BPDB)][BPDC]}n (CP1) and {[Cd(H2O) (BrIP)(BTTMB)]·4MeOH}n (CP2) have been synthesized by solvothermal methods and characterized by several analytical tools including SXRD (Single Crystal X-ray Difraction). Structure of CP1 can be described as a 1D cationic chain, {[Cd(H2O)4(4-...

The present work reports on synthesis, characterization and crystal structure of a neutral two-dimensional adenine based luminescent coordination polymer (LCP) with Zn(II) metal node. Photoluminescence (PL) property of the d10 LCP [Zn(µ2-1H-ade)(µ2-SO4)] (1) has been exploited to use 1 as a dual detection probe for the selective sensing of Hg2+ as...

Selective C-2 functionalization of N-protected and free indoles is reported. The ruthenium-catalyzed C-2 activation of indoles provided an easy access to cyclopentenylated indoles. Hydroheteroarylated bicyclic motifs were synthesized via iridium-catalyzed C-2 activation of NH indoles. The methodology was extended to different bicyclic adducts such...

An efficient stereoelective route for the synthesis of cyclopentene fused 2-pyrrolines has been established via a Pd-catalyzed C-H activation/ oxidative coupling of aryl enamides with diazabicyclic olefins. The proposed two-stage mechanism was successfully proved by isolating the intermediate trans-disubstituted cyclopentene.

Two new isostructural luminescent metal-organic frameworks (LMOFs); {[M(BDC)(L)].xG}n, comprising Zn2+ (1) or Cd2+ (2) nodes, 4-pyridyl carboxaldehyde isonicotinoylhydrazone (L), Benzene-1,4-dicarboxylic acid (H2BDC) and lattice guests (G) have been synthesized by diffusion, conventional and mechanochemical routes and thoroughly characterized. Sing...

Activated olefins are well known nucleophiles, but proton abstraction from the substituted α-methyl group in nitroolefin is rare. We report the first DBU-catalysed one-pot reaction of TFMK and activated nitroolefin followed by intramolecular cyclization reaction, to construct stereogenic center containing a furan core with CF3 in excellent yields (...

Employing 1-(2-methoxybenzyl)-2-(2-methoxyphenyl)-1H-benzimidazole (bpb) as a monodentate ligand, a new greenish blue copper(II) complex, [Cu(bpb)2(NO3)2] (1a), has been synthesized. 1a has been characterized analytically and spectroscopically. The X-ray crystal structure of 1a reveals that it adopts a cis disposition with respect to the ligands. T...

A facile synthesis of highly substituted as well as conjugated unsymmetrical azines via the reaction of propargyl alcohols and isatin hydrazones in the presence of iodine is demonstrated under open to air. A series of unsymmetrical azines have been synthesized with excellent yields from simple and readily available starting materials in a complete...

N-heterocyclic carbene (NHC) catalyzed synthesis of highly functionalized pyrano[3,2-c]chromene-2,5-dione derivatives, pyrano[3,2-c]quinoline-2,5(6H)-dione derivatives and pyrano[4,3-b]pyran-2,5-dione derivatives with potential biological activities is reported. The reaction occurs via a Knoevenagel condensation and NHC-catalyzed enolate addition i...

The diversity-oriented organic synthesis of novel indole annulated tricyclic [1,3]-thiazepino, thiazocino, thiazonino, thiazecino, thiazacycloundecino scaffolds with Z-selective and the symmetrical pentacyclic thiazaindole macrocyclic derivatives was demonstrated from 2-oxindole via ring-closing metathesis reaction as the key step in the presence o...

A series of non-heme (μ-oxo)bis(μ-dicarboxylato)-bridged diiron(iii) complexes, [Fe2(O)(OOCH)2(L)2](2+), [Fe2(O)(OAc)2(L)2](2+), [Fe2(O)(Me3AcO)2(L)2](2+), [Fe2(O)(OBz)2(L)2](2+), [Fe2(O)(Ph2AcO)2(L)2](2+) and [Fe2(O)(Ph3AcO)3(L)2](2+), where L = N,N-dimethyl-N'-(pyrid-2-ylmethyl)ethylenediamine, OAc(-) = acetate, Me3AcO(-) = trimethylacetate, OBz(...

Coordinatively unsaturated double-stranded helicates [(H2L)2Eu2(NO3)2(H2O)4](NO3)4, [(H2L)2Tb2(H2O)6](NO3)6, and [(H2L)2Tb2(H2O)6]Cl6 (H2L=butanedioicacid-1,4-bis[2-(2-pyridinylmethylene)hydrazide]) are easily obtained by self-assembly from the ligand and the corresponding lanthanide(III) salts. The complexes are characterized by X-ray crystallogra...

An N-heterocyclic carbene (NHC)-mediated homoenolate reaction strategy for the efficient synthesis of a wide variety of tricyclic pentenes with potential biological activity is reported.

Two dimensional metal organic frameworks [Cd(5-BrIP)(TIB)]n (1) and [Ni2(5-BrIP)2(TIB)2]n (2) involving aromatic polycarboxylate ligand 5-Bromo isophthalic acid (H2BrIP) in combination with flexible tripodal ligand 1,3,5-tris(imidazol-1-ylmethyl)benzene (TIB) as linkers has been synthesized with Cd(II)/Ni(II) metal salts by different methods. All t...

CF3 substituted β-nitronitriles with an all-carbon quaternary stereogenic center have been synthesized via asymmetric cyanation reaction. In situ generated chiral TiIV salen complexes were used as catalysts for asymmetric addition of TMSCN to nitroolefins containing a trifluoromethylated prochiral center in the β-position, to afford the correspondi...

An expeditious and convenient method for the generation of 11–21-membered intramolecular macrocyclic sulfonium ylides using catalytic Rh2(OAc)4 is presented. Using this approach, a wide variety of sulfur-macrocycles incorporating the oxindole unit were produced in good yields and with high diastereoselectivity. Interestingly, tetracyclic macrocycle...

Intramolecular cyclopropanation followed by ring opening of remotely placed furan was demonstrated using rhodium(II) catalyzed cyclic diazoamides tethered on furan to produce 12- to 23-membered oxindole incorporated macrocycles. The length of the spacer is an important factor to decide the stereoselectivity of the product.

A first highly enantioselective addition of naphthols and sesamol to indolylidene cyanoacetate derived from isatins was carried out in the presence of bi-functional quinine thiourea as organocatalyst. Under optimized reaction conditions the present catalytic system gave spiro-oxindole derivatives with excellent yield and enantioselectivity (up to 9...

Coordinatively unsaturated double-stranded heli-cates [(H 2 L) 2 Eu 2 (NO 3) 2 (H 2 O) 4 ](NO 3) 4 , [(H 2 L) 2 Tb 2 (H 2 O) 6 ]-(NO 3) 6 , and [(H 2 L) 2 Tb 2 (H 2 O) 6 ]Cl 6 (H 2 L = butanedioicacid-1,4-bis[2-(2-pyridinylmethylene)hydrazide]) are easily obtained by self-assembly from the ligand and the corresponding lanthanide(III) salts. The com...

The concept of bio-metal-organic framework (bio-MOF) catalysts for CO2 transformation was devised using l-glutamic acid as the natural surrogate for synthetic ligands, and demonstrated their catalytic efficacy for the first time, in the cycloaddition of CO2 with epoxides, supplemented with the structure-DFT correlation. The water stable amino acid...

A family of calix[4]arene compounds containing crown moieties at both the upper and lower rims of the calix unit with different substituents attached to the nitrogen atom of the aza-crown moiety have been synthesized, characterized and their competitive binding property towards Li+, Na+, K+, Mg2+, Ca2+ and Sr2+ in aqueous media has been investigate...

In this highlight two aspects of chiral Metal-Organic Frameworks, particularly, the synthetic approaches to achieve chiral MOFs and their applications have been discussed. There has been considerable research advancement towards the synthesis of chiral MOFs by direct or indirect methods. More recently homochiral MOFs have been exploited for valued...

The N-heterocyclic carbene (NHC)-organocatalyzed enantioselective annulation reaction of pyrazolones with α,β-unsaturated aldehydes proceeding via the chiral α,β-unsaturated acyl azolium intermediates under oxidative conditions is presented. The reaction afforded dihydropyranone-fused pyrazoles in moderate to good yields and good er values under op...

Two dual ligand isostructural coordination polymers [Co(BrIP)(BIX)]n (1) and [Zn(BrIP)(BIX)]n (2), where BrIP = 5-bromoisophthalate and BIX = 1,4-bis(imidazol-1-ylmethyl)-benzene, have been efficiently synthesized by liquid assisted grinding methods. Single crystals of 1 were harvested by the solvothermal technique and phase pure 1 or 2 can be quan...

Luminescent two dimensional coordination polymers {[Cd(SDB)(H2O)].3H2O}n 1, {[Zn3(µ-OH)2(SDB)2].(PPZ)}n 2, (where SDB = 4,4′-sulfonyldibenzoate ; PPZ = Piperazine) have been synthesized by solvothermal methods. Crystal structure of 1 revealed that carboxylate moiety of SDB ligands are involved in “paddlewheel” type coordination with the metal nodes...

New pseudopolymorph of a O,N,N’-donor hydrazone ligand, 2-pyridylcarboxaldehyde isonicotinoylhydrazone (L) and its discrete complexes with K+ and Ba2+ have been reported. L forms isostructural dinuclear complexes with K+ when bromide and iodide were employed as counter anions. However, a monomeric complex in the case of Ba2+ with existence of coord...

The palladium-catalyzed ring opening of cyclopropane- and vinylcyclopropane-appended spirotricyclic olefins by employing active methylene compounds, phenols and organoboronic acids is discussed in detail. The present strategy provides a facile route for the synthesis of biologically significant, functionalized spiro[2.4]heptenes under mild reaction...

A neolignan, erythrosurinamensin and a diaryl phenyl propanoid, virolane were isolated from Myristica fragrans for the first time. Apart from these two, previously known steroids, other lignans and neolignans were isolated from the fruit pericarp of M. fragrans. The structures of the compounds were identified by employing various spectroscopic meth...

Cu(ii) Schiff base complexes Cu(ii)- and Cu(ii)- based on 2-acetyl pyridine with both (1R,2R)-1,2-diaminocyclohexane and (1S,2S)-1,2-diaminocyclohexane were synthesized in a single step. Subsequent reduction of ligands and with NaBH4 followed by complexation with Cu(OTf)2 resulted in generation of two more additional chiral centers in complexes Cu(...

The reaction of arynes with indene/benzofurans has been developed. The arynes were generated from 2-(trimethylsilyl)aryl triflates by the fluoride-induced 1,2-elimination react with indene or various benzofurans proceeding via a cascade reaction involving the Diels-Alder reaction and a [2 + 2] cycloaddition reaction. The tandem process afforded fun...

Two ternary coordination polymers (CPs) {[Co3(BTC)2(TIB)2(H2O)4]·(H2O)4}n (1) and {[Cu3(BTC)2(TIB)2(H2O)2]·(H2O)6}n (2) comprising tripodal linkers 1,3,5-benzenetricarboxylate (BTC) and 1,3,5-tris(imidazol-1-ylmethyl)benzene (TIB) are synthesized and characterized by single crystal X-ray diffraction and other physicochemical techniques. Adsorption...

A facile one-pot benzannulation strategy involving phosphine-3-alkyl allenoate zwitterions and cyclic 1,2-diones is described. The strategy is effectively utilized in the synthesis of fluoranthenes and benzo[a]aceanthrylenes with impressive photophysical properties. This is the first report on an intermolecular benzannulation using a 3-alkyl alleno...

Four mononuclear iron(iii) complexes of the type [Fe(L)Cl3] , where L is a tridentate 3N ligand such as (2-pyridin-2-ylethyl)(pyridin-2-ylmethyl)amine (), (methyl)(2-pyridin-2-ylethyl)(pyridin-2-ylmethyl)amine (), bis(pyridin-2-ylethyl)amine (), and (1-methyl-1H-imidazol-2-ylmethyl)(pyridin-2-ylethyl)amine (), have been isolated and studied as func...

The water soluble mixed ligand copper(ii) complexes of the type [Cu(sal)(diimine)(ClO4)]2, where sal is salicylaldehyde and diimine is 2,2'-bipyridine (bpy, ), 1,10-phenanthroline (phen, ), 5,6-dimethyl-1,10-phenanthroline (5,6-dmp, ), 3,4,7,8-tetramethyl-1,10-phenanthroline (3,4,7,8-tmp, ) or dipyrido[3,2-d:2',3'-f]quinoxaline (dpq, ), and [Cu(sal...

Co-crystals comprising the active pharmaceutical ingredient 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene, C12H10N4, and the chiral co-formers (+)-, (−)- and (rac)-camphoric acid (cam), C10H16O4, have been synthesized. Two different stoichiometries of the API and co-former are obtained, namely 1:1 and 3:2. Crystallization experiments suggest that the...

The present work deals with the synthesis of diester-dicarboxylic acid (DEDA)-Melamine co-crystal, characterized using UV-Visible absorption, scanning electron microscope and X-ray diffraction techniques. Single crystal X-ray analysis is carried out to confirm the formation of DEDA-Melamine co-crystal. Phthalic anhydride is used as the main source...

New chiral manganese complexes of N4 ligands derived from 2-acetylpyridine were prepared and used as catalysts in the enantioselective epoxidation of olefins, using H2O2 as an oxidant to give epoxides, with excellent conversions (up to 99%) and enantiomeric excess (up to 88%) within 1 h at 0 °C. A detailed mechanistic study was undertaken based on...

An unexpected transformation of 1,6-diarylhexa-1,5-diene-3,4-diones (cinnamils) to 2,3,8-triaryl vinyl fulvenes via N-Heterocyclic Carbene (NHC) catalysis is reported. Mechanistic as well as synthetic novelty is the hallmark of this reaction.

Three ternary coordination polymers (CPs), namely, {[Cd2(BrIP)2(BITMB)(H2O)2]. (THF)2.H2O}n (CP1), [Cu(BrIP)(BITMB)(H2O)]n (CP2), {[Ni(BrIP)(BITMB)(H2O)]. (THF)(H2O)2}n (CP3) have been synthesized by solvothermal reactions between H2BrIP (5-bromoisophthalate), BITMB (1,3-bis(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene) and respective metal nitrates...

Herein we describe a ligand free rhodium(I) catalyzed stereoselective ring-opening of cyclopropane appended spirotricyclic olefins through C-H bond cleavage of boronic acid. The developed methodology leads to the formation of aromatic molecules functionalized with trans-disubstituted spiro[2.4]hept-4-ene and cyclopropane appended spirotricyclic fra...

A series of half-sandwich Ru(ii) arene complexes of the type [Ru(η(6)-arene)(L)Cl](PF6) , where arene is benzene (, ) or p-cymene (, ) and L is N-methylhomopiperazine () or 1-(anthracen-10-ylmethyl)-4-methylhomopiperazine (), has been isolated and characterized by using spectral methods. The X-ray crystal structures of , and reveal that the compoun...