Zinc Perchlorate Hexahydrate Catalysed Conjugate Addition of Thiols to α,β-Unsaturated Ketones
作者:Asit K. Chakraborti、Sanjeev K. Garg、Raj Kumar
DOI:10.1055/s-2005-868480
日期:——
provides a means to carry out the reaction under versatile experimental conditions. The rate of thiol addition was dependent on the electronic and steric factors of the enones and the thiols. The substituent at the β-carbon of the α,β-unsaturated ketone substrate caused steric hindrance during conjugateaddition and required longer reaction times. The rate of reaction for alkane thiols e.g. ethanethiol was
已发现六水合高氯酸锌 (II) 是一种新型高效催化剂,可在室温下无溶剂条件下将硫醇与 α,β-不饱和酮共轭加成。芳基、芳烷基和烷基硫醇与环状和非环状 α,β-不饱和酮的反应在 5 分钟到 6 小时后发生,产率极好。Zn(ClO 4 ) 2 .6H 2 O 与不同溶剂的相容性提供了一种在多种实验条件下进行反应的方法。硫醇加成速率取决于烯酮和硫醇的电子和空间因素。α,β-不饱和酮底物的β-碳上的取代基在共轭加成过程中引起空间位阻,需要更长的反应时间。烷烃硫醇的反应速率,例如
Oxidation in Fluoro Alcohols: Mild and Efficient Preparation of Disulfides from Thiols
Quantitative oxidative conversion of thiols to disulfides was effected by aqueous 30% H2O2 in trifluoroethanol at ambient temperature under neutral conditions.
Oxidation of thiols to disulfides with molecular bromine on hydrated silica gel support
作者:Mohammed Hashmat Ali、Mario McDermott
DOI:10.1016/s0040-4039(02)01220-0
日期:2002.8
Results of oxidation of thiols to disulfides with molecular bromine on silicagel solid support are reported. The procedure utilizes organic media and does not require a base to neutralize HBr by-products to suppress acid promoted side reactions. Utilization of silicagelsupport simplifies work up and product isolation.
Modified polyacrylamide supported chlorochromate as a new polymeric oxidizing agent
作者:Bahman Tamami、Roghaye Heiran、Riazi Montazer
DOI:10.2298/jsc110131216t
日期:——
Modified polyacrylamide-supported chlorochromate was synthesized and used as a versatile and efficient oxidizingagent for the oxidation of various organic compounds, such as hydroxyl compounds, silylethers, oximes, thiols, and others. Over oxidation of the products (aldehydes to carboxylic acids) was not observed with this oxidizingagent. The oxidant was insoluble in the oxi- dation media and the
SOLID-PHASE OXIDATION OF ORGANIC COMPOUNDS WITH BENZYLTRIPHENYLPHOSPHONIUM DICHROMATE
作者:A. R. Hajipour、Iraj Mohammadpoor-baltork
DOI:10.1080/10426500008045240
日期:2000.1
Abstract Benzyltriphenylphosphonium dichromate could be used for oxidation of organic compounds such as alcohols, thiols and sulfides to the corresponding carbonyl, disulfide and sulfoxide derivatives under solid-phase conditions. This reagent is very easily prepared from an aqueous solution of benzyltriphenylphosphonium chloride with CrO3 in 3 N HCI at room temperature. The reagent, is a stable orange