Spectroelectrochemical study of the nucleophilic substitution of diacyl disulfides by 2-nitrophenyl thiolate ions in N,N,-dimethylacetamide

Article Abstract:

Spectroelectrochemical study has been carried out on the nucleophilic substitution of diacyl disulfides by 2-nitrophenyl thiolate ions in N,N,-dimethylacetamide. The apparent SNAr process in which A-aryl thiol esters RC(O)SAr and ArS2- are the end products from reacting bis(2-nitrophenyl) disulfide Ar2S2 and thiocarboxylate ions RC(O)S- at 20 degrees C. occurs in two steps. That can be seen from UV-vis absorption spectrophotometry with voltammetry. R can be Me or Ph.

France, Research, Substitution reactions

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The reactions of a 1-alkenesulfenate anion with TMS-X reagents; a variable temperature NMR study

Article Abstract:

Treating lithium (E)-1-hexenesulfenate with several trimethylsilyl (TMS)-X reagents gives NN-bis(trimethylsilyl)-(E)-1-hexenesulfenamide and/or di((E)-1 hexenyl)disulfide, but in low yield, for the most part. Variable temperature NMR (VT NMR) was used to analyze the cleanest reactions, one of which was to TMS-CN, which then yields the above disulfide. An NMR study of (E)-1-hexenesulfenate has been made.

Methods, Nuclear magnetic resonance

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Friedel-Crafts catalysis using supported reagents. Synthesis, characterization, and catalytic application of sol-gel-derived silica

Article Abstract:

Sol-gel synthesis of silicas incorporating zinc chloride permits the development of mesoporous materials with higher catalytic activity than Clayzic. Friedel-Crafts alkylation catalyst activity is dependent on pore size and distribution, with the most active materials having pore diameters greater than 8 nanometers.

Usage, Catalysts, Silica, Porous materials, Zinc compounds, Silicon dioxide, Zinc chloride

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