Johan Hendrik Lodewikus Jordaan

Johan Hendrik Lodewikus Jordaan
North-West University | NWU · Chemical Resource Beneficiation

PhD

About

37
Publications
5,976
Reads
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398
Citations
Introduction
Johan Hendrik Lodewikus Jordaan currently works at the Chemical Resource Beneficiation, North West University South Africa. Johan does research in Analytical Chemistry, Catalysis and Chemical Kinetics. Their current project is 'Olefin metathesis' with application in MS, NMR TGA-FTIR GC-MS, EPR, SC-XRD.
Additional affiliations
January 2001 - present
North-West University
Position
  • Senior Subject Specialist
February 2004 - present
North-West University
Position
  • Analytical Chemistry
Education
January 2000 - May 2005
North West University
Field of study
  • Organic Chemsitry
January 1998 - January 2000
North West University
Field of study
  • Organic Chemistry
January 1997 - December 1997
North West University
Field of study
  • Chemistry

Publications

Publications (37)
Article
Full-text available
We report a new synthetic approach for the synthesis of less‐explored unsymmetrical pyridyl‐formamidine ligands and their coordination behaviour to form Mn(I), Cu(II), Zn(II), and Pd(II) complexes. The one‐step process for synthesising the unsymmetrical pyridyl‐formamidine compounds offers the advantage of being functional‐group tolerant and less c...
Article
Four pyridinyl alcohols and the corresponding hemilabile pyridinyl alcoholato ligand containing ruthenium carbene complexes of the Grubbs second generation-type [RuCl(H2IMes)(O^N)(= CHPh)], where [O^N = 1-(2′-pyridinyl)-1,1-diphenyl-methanolato, 1-cyclopentyl-1-(2’-pyridinyl)-methanolato, 1-cyclohexyl-1-(2′-pyridinyl)-methanolato, and 1-cycloheptyl...
Article
Full-text available
Non-template [2 + 2] condensation of benzene-1,4-dicarboxaldehyde with two diamines: ethane-1,2-diamine and propane-1,2-diamine was carried out to give Ligands 1 and 2. Additionally, template [1 + 2] condensation of benzene-1,4-dicarboxaldehyde with ethane-1,2-diamine and propane-1,2-diamine were also carried out to give Ligands 3 and 4. These were...
Article
Full-text available
Four new Grubbs-type precatalysts [RuCl(H2IMes)(O^N)(=CHPh)], where [O^N = α,α-diphenyl-(3-methylpyridin-2-yl)methanolato, α,α-diphenyl-(4-methylpyridin-2-yl)methanolato, α,α-diphenyl-(5-methylpyridin-2-yl)methanolato and α,α-diphenyl-(3-methoxypyridin-2-yl)methanolato] were synthesized and tested for their activity, stability and selectivity in th...
Article
Full-text available
The paper presents a comprehensive survey on the synthetic procedures of transition metal complexes of α-pyridinyl alcoholato, α-bipyridinyl alcoholato, α,α’-pyridinyl dialcoholato and α,α’-bipyridinyl dialcoholato ligands and their coordination chemistry. Greater emphasis is, however, given to the catalytic activity of the complexes in homogeneous...
Article
Energy storage via liquid organic hydrogen carrier (LOHC) systems has gained significant attention in recent times. A dibenzyltoluene (DBT) based LOHC offers excellent properties which largely solve today's hydrogen storage challenges. Understanding the course of the dehydrogenation reaction is important for catalyst and process optimization. There...
Article
Herein a bis(pyridyl)-N-alkylamine/CuI/TEMPO/NMI catalyst system is reported for aerobic oxidation of a variety of primary alcohols to the corresponding aldehydes using readily available reagents, at room temperature and ambient air as the oxidant. ESI-MS analysis of the reaction showed the formation of a [(L1)(NMI)CuII-OOH]+ species, which is a ke...
Article
Full-text available
Coordination compounds of 4-hydroxy-3-nitro-2 H -chromen-2-one and their mixed ligand complexes with aminoethanoic acid and pyrrolidine-2-carboxylic acid were synthesized by the reaction of Cu(II) and Zn(II) salts in molar ratio 1 : 2 for the coumarin complexes and 1 : 1 : 1 for the mixed ligand complexes, in basic media. The compounds formed were...
Article
Full-text available
Four pyridinyl alcohols and the corresponding hemilabile pyridinyl alcoholato ruthenium carbene complexes of the Grubbs second generation-type RuCl(H2IMes)(O^N)(=CHPh), where O^N = 1-(2′-pyridinyl)-1,1-diphenyl methanolato, 1-(2′-pyridinyl)-1-(2′-chlorophenyl),1-phenyl methanolato, 1-(2′-pyridinyl)-1-(4′-chlorophenyl),1-phenyl methanolato and 1-(2′...
Article
Concentration of the surface active agents in industrial products is a common source of error. In order to compare the efficiency of a number of polyisobutylene succinic anhydride (PIBSA) based surfactants, their concentration needs to be determined with a fair degree of accuracy. Industrial samples of the monoethanolamine adduct of PIBSA (PIBSA-ME...
Article
A series of mononuclear (C1–C4) and dendritic G1 (DC1–DC4) and G2 (DC5–DC8) cationic CuI iminopyridine complexes of the general formula [Cu{(R-C5H3N)CH=N(nPr)-κ2-N,N}2][BF4] (C1: R = 6-Me; C2: R = H; C3: R = 6-Br; C4: R = C4H3) and [DAB-Gx-PPI-(Cu{(R-C5H3N)-κ2-N,N}y)z][BF4]n [DAB: 1,4-diaminobutane; PPI: poly(propyleneimine); for G1: x = 1, y = 4,...
Article
Compounds L1-L6 (3-ferrocenylpyrazole (L1), 3-ferrocenyl-5-methylpyrazole (L2), 3-ferrocenylpyrazolyl-methylenepyridine (L3), 3-ferrocenyl-5-pyrazolyl-methylenepyridine (L4), 3-ferrocenylpyrazolyl-ethylamine (L5) 3-ferrocenyl-5-pyrazolyl-ethylamine (L6)) reacted with [NiBr2(DME)] or [NiCl2.6H2O] to give the mononuclear nickel complexes [NiBr2(1-L1...
Article
The catalytic performance of the diphenyl-substituted pyridinyl alcoholato ruthenium carbene precatalyst of the Grubbs 2-type was optimized for 1-octene metathesis by varying operating parameters, such as reaction temperature (30–100 °C) and catalyst load (Ru/1-octene molar ratio between 1:5000 and 1:14000). Secondly, the catalyst was tested with o...
Article
The reaction of Zn(OAc)2 with 3-ferrocenylpyrazol-1-ylmethylenepyridine (L1), 3-ferrocenyl-5-methylpyrazol-1-ylmethylenepyridine (L2), 3-ferrocenylpyrazol-1-ylethylamine (L3) and 3-ferrocenyl-5-pyrazol-1-ylethylamine (L4) afford the corresponding zinc complexes [Zn(CH3COO)2(L1)] (1), [Zn(CH3COO)2(L2)] (2), [Zn(CH3COO)2(L3)] (3), and [Zn(CH3COO)2(L4...
Article
Other than their valuable use as starting materials and intermediates in the synthesis of drugs and other important organic compounds, pyridinyl alcohols are largely used as hemilabile chiral chelating ligands in the development of homogeneous transition metal catalysts. The pyridinyl alcohols covered in this review are divided into four types base...
Article
Other than their valuable use as starting materials and intermediates in the synthesis of drugs and other important organic compounds, pyridinyl alcohols are largely used as hemilabile chiral chelating ligands in the development of homogeneous transition metal catalysts. The pyridinyl alcohols covered in this review are divided into four types base...
Article
The productive self-metathesis of 1-octene with a series of new phosphine ligated Grubbs-type precatalysts was studied. The resulting structures were used to compare some steric properties of the new precatalysts with those of well-known precatalysts. The possibility of α-CC agnostic stabilization as well as the ability of the ligands to shield the...
Article
The self-metathesis reaction of 1-octene with several well-known Grubbs-type precatalysts and the new Z-selective Grubbs precatalyst were studied with molecular modeling. The obtained Gibbs-free energy values for all the steps during the productive metathesis of 1-octene were compared to the values obtained for some low catalytic activity precataly...
Article
Full-text available
Hemilabile ligands can release a free coordination site "on demand" of an incoming nucleophilic substrate while occupying it otherwise. This is believed to increase the thermal stability and activity of catalytic systems and therefore prevent decomposition via free coordination sites. In this investigation chelating pyridinyl-alcoholato ligands wer...
Article
Full-text available
Functionalizing pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8-11-one and 1-phenyl-pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8-11-one can be easily accomplished by using the alcohols of various alkynes and alkenes. Generally the synthesis of terminal alkyne and cyclic alkene ketal derivatives were performed fairly easily. Synthesis of the terminal alk...
Article
Advanced analytical techniques were performed on four South African coals, three noncoking and one coking, containing different maceral contributions (vitrinite contents ranging between 24 and 66 vol %, m.m.f.b.). Inertinite-rich (INY, UMZ) and vitrinite-rich (G#5 and TSH) coals were investigated to quantify differences and similarities in structur...
Conference Paper
Full-text available
Tars and chars derived from four typical South African coals (confined to the large particle regime) at 450°C and 750°C respectively were subjected to different advanced analytical techniques in order to evaluate respective structural features. GC/MS, GC/FID, SEC, SIMDIST and NMR analyses were performed an all generated tars, while chars generated...
Article
Full-text available
Diverse natural and anthropogenic activities in the Highveld of South Africa contribute to elevated levels of inorganic and organic gaseous pollutant species. The primary aims of this investigation were to determine spatial and temporal distributions of nitrogen dioxide (NO 2), sulphur dioxide (SO 2) and ozone (O 3), as well as benzene, toluene, et...
Conference Paper
Full-text available
Diverse natural and anthropogenic activities in the Highveld of South Africa contribute to elevated levels of inorganic and organic gaseous pollutant species.
Article
The productive self-metathesis reaction of 1-octene in the presence of the Phobcat precatalyst [RuCl2(Phoban-Cy)2(=CHPh)] using density functional theory was investigated and compared to the Grubbs 1 precatalyst [RuCl2(PCy3)2(=CHPh)]. At the GGA-PW91/DNP level, the geometry optimization of all the participating species and the PES scans of the vari...
Conference Paper
The formation of a brown haze due to urban pollution is a common phenomenon in many industrialised cities in the world. Cape Town in South Africa is renowned for its scenic beauty but this is marred by a brown haze layer that develops on certain days during inversion and windless conditions in the winter. In order to identify and quantify the tempo...

Questions

Question (1)
Question
I need to do some kinetic work on a ruthenium complex, and in need of a suitable solvent that will not interact with the complex or any of the substrates.

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