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Publications
Publications (27)
Among their many applications, metal pincer complexes are of interest for their properties as catalysts in cross-coupling reactions. Pincer ligands exhibit tridentate coordination to the metal center and occupy the meridional positions forming two chelate rings. The two Ni(II) POCOP pincer complexes with a fluorothiophenolate ligand reported herein...
Reaction of [(η⁴-COD)Ir(Cl)PR´3] (R´ = Ph, 1; Me, 2) with lithium(oxobutadienide) (4) and lithium(2,4-dimethyl-oxopentadienide) (5) affords the η³-oxopentadienyl [(η⁴-COD)Ir(η³-exo-syn-syn-CH2CHCHCHO)PPh3] (6), the alkenyl carbonyl [(η⁴-COD)Ir(η¹-CHCHMe)(CO)PMe3] (7), and the 2,4-dimethyl-η³-oxopentadienyl [(η⁴-COD)Ir(η³-exo-syn-anti–CH2CMeCHCMeO)P...
Phytochemical investigation of the leaves and flowers from Salvia hirsuta led to the isolation of the five microphyllane-type diterpenoids (1–5), and two flavones (6–7). Hirsutolides constituted new diterpenoids containing a 5-hydroxyfuran-2(5H)-one and were isolated as an epimeric mixture at C-3 and C-15. The structures of the isolated compounds w...
Both DNA barcoding and phylogenetic data of the studied botanical material suggested the existence a new population of Galphimia glauca. Their leaves afforded three new nor-3,4-seco-friedelanes named galphimines M-O, together with known galphimines D, E, G, and I. Galphimines M and N possess bicyclic orthoacetates which are the first examples of or...
The metathesis reaction of IrCl(CO)(PPh3)2 (4) and Vaska-type derivatives IrCl(CO)(PR3)2 (PR3 = MePh2, 5; Me2Ph, 6; Me3, 7) with 1–2 equivalents of the potassium butadienesulfinate salts K(SO2CHCRCHCH2) (R = H, 2; Me, 3) led to the formation of mixtures of chiral diastereomers “a” and “b” of general formula Ir(1–2,5-η-CH2CHCRCHSO2)(CO)(L)2 (R = H,...
Reaction of [(η ⁴ -COD)Ir(μ 2 -Cl)] 2 (1) with tin CH 2 CRCHCRCH 2 SnR′ 3 (R = H, Me; R’ = Me, n-Bu) or lithium pentadienide reagents gives the corresponding acyclic pentadienyl sandwich compounds [(η ⁴ -COD)Ir(η ⁵ -CH 2 CMeCHCMeCH 2 ) (2) and [(η ⁴ -COD)Ir(η ⁵ -CH 2 CHCHCHCH 2 ) (3). Treatment of 1 with different phosphines affords the well-known...
Nine terpenoids were isolated from the leaves and flowers of Salvia amarissima, including a new acylated diterpenoid glucoside, amarisolide F (1), a new neo-clerodane diterpenoid, amarissinin D (2), which was isolated as an acetyl derivative (2a), and four known diterpenoids. The structure of amarisolide F (1) was elucidated by NMR and MS data anal...
Four copper(II) coordination compounds from 2-benzimidazole propionic acid (Hbzpr) and 4-(benzimidazol-2-yl)-3-thiobutanoic acid (Hbztb) were synthesized and fully characterized by elemental analyses, electronic spectroscopy, FT-IR and mass spectrometry. The molecular structure for the four complexes was confirmed by single-crystal X-ray crystallog...
Spectroscopic and single crystal X-ray diffraction studies of coordination compounds of CoII, NiII, ZnII and PdII with phenylsulfonyl imidazole and benzimidazole derivatives (2-mfsiz, 2-mfsbz) were performed. The relevance of non-covalent interactions on the stabilization of intra and intermolecular arrangements in the ligands and their coordinatio...
Novel tinidazole (tnz) coordination compounds of different geometries were synthesised, whose respective solid-state packing appears to be driven by inter- and intramolecular lone pair•••π interactions. The copper(II) compounds exhibits interesting redox properties originated from both the tnz and the metal ion. These complexes interact with DNA th...
A series of non-symmetric Pd(II)-POCOP pincer complexes were synthesized in a facile manner from the commercially available starting material 2',4'-dihydroxyacetophenone. The preparation of the complexes was carried out in a single step affording the corresponding ketone-functionalized pincer complexes. The molecular structures of two complexes wer...
Eleven neo-clerodane diterpenoids (1–11) including the new analogues 1, 2, and 10, and 3′,5,6,7-tetrahydroxy-4′-methoxyflavone (12) were isolated from the aerial parts of Salvia polystachya. Polystachyne G (1) and 15-epi-polystachyne G (2) were isolated as an epimeric mixture, containing a 5-hydroxyfuran-2(5H)-one unit in the side chain at C-12 of...
Reaction of IrCl(PMe3)3 with one equivalent of K(SO2CHCHCHCH2) led to the formation of Ir(1-2,5-η-CH2CHCHCHSO2)(PMe3)3 (1). The reaction of 1 with HBF4⋅Et2O takes place rapidly at low temperature to give the metallacycle [Ir(2,5-η-MeCHCHCHSO2)(PMe3)3]BF4 (2). Complex 2 reacts with CH3CN, CD3CN and CO to give the corresponding adducts [Ir(2,5-η-MeCH...
NMR and single crystal X-ray diffraction analysis of seven clerodanes from Mexican Salvia species was performed. We focused on clerodanes with tertiary hydroxyl group at C-4, C-8, and C-10, in which the establishment of absolute configuration around these chiral centers is nontrivial and the ¹³C NMR signals can be misassigned. In addition, the anal...
Condensation of 8-hydroxyquinoline-2-carbaldehyde with 2-aminophenol gave the (E)-2-[(2-hydroxyphenylimino)methyl]quinolin-8-ol derivative that reacted with di-n-butyltin oxide with release of H2O to yield the chelate title complex, [Sn2(C4H9)4(C16H10N2O2)2]. The compound crystallizes in the triclinic space group P-1, with two independent...
The structure of the dimeric eudesmanolide hydroxy-bis-dihydrofarinosin (1) from Encelia farinosa followed after contrasting their 1H and 13C NMR spectra with those of encelin (6), hydroxy-bis-dihydroencelin (3), and farinosin (4). Structure 1 was verified by single crystal X-ray diffraction analysis, which further provided the streochemistry of th...
The authors regret. 3. Results and discussion. Page 5, 1st column, 2nd paragraph. Revised to: “In the ¹H NMR spectra, two signals of vinylic protons at δH 6.07 (d, J = 10.4 Hz) and 5.83 (dd, J = 10.4, 3.7 Hz) appeared, assigned to H-1 and H-2 by the COSY correlations between them. In the ¹³C NMR spectra, two signals for oxygenated carbons at δC 75....
Coordination compounds with ronidazole (ron) and the transition metals CoII, NiII, CuII, ZnII, CdII and HgII were synthesized and characterized by spectroscopic and analytical techniques. Ronidazole presented monodentate or bidentate coordination modes. A five membered chelate ring was formed by coordination of the carbamate oxygen (C–O–C) and the...
