Silica chloride is used as a selective and effective heterogeneous catalyst for the rapid conversion of thiols to disulfides with quantitative yields in a very short period of time.
氯化硅用作选择性和有效的多相催化剂,用于在很短的时间内以定量收率快速将硫醇转化为二硫化物。
Efficient and Convenient Oxidation of Thiols to Symmetrical Disulfide with Silica–PCl<sub>5</sub>/NaNO<sub>2</sub>in Water
作者:Uma Pathak、Lokesh Kumar Pandey、Sweta Mathur
DOI:10.1080/00397910802697442
日期:2009.7.21
Abstract A very simple, environmentally benign, cost-effective, and efficient synthesis of disulfides from thiols using silica–PCl5/NaNO2 in aqueous medium has been described. The reaction was found to occur rapidly under mild conditions, and disulfides were obtained easily through a simple workup.
thiols react smoothly with dialkyl dicyanofumarates in CH2Cl2 at room temperature to give the corresponding disulfides in excellent yields. Aliphatic 1,2-, 1,3-, and 1,4-dithiols afford cyclic disulfides. Analogous reaction courses were observed starting with selenols, and the required diselenides were also formed in nearly quantitative yields. In all of the reactions, dialkyl dicyanosuccinates formed
Oxidation of thiols with metal nitrates supported on TAFF
作者:Gabriel Arroyo、Roberto Osnaya、Tonatiuh Cruz、Amparo Londoño、Cecilio Álvarez、Francisco Delgado、Ricardo Santiago、René Miranda
DOI:10.1002/hc.10138
日期:——
Twelve thiols were readily oxidized to the corresponding disulfides by means of four metalnitratessupported on TAFF, a bentonitic clay, under mild conditions. However, in some cases, thioethers and other interesting by-products were detected. Some of the disulfides showed antimicotical activities against Aspergillus fumigatus, Aspergillus niger, Aspergillus candidus, Microsporum gypseum, Candida
Catalytic Transformations of Thiiranes by the W(CO)<sub>5</sub> Grouping. A New Route to Cyclic Polydisulfides
作者:Richard D. Adams、Joachim A. Queisser、John H. Yamamoto
DOI:10.1021/ja960460l
日期:1996.1.1
interesting new transformations of thiirane, 2(R),3(S)-dimethylthiirane (cis-DMT), and 2(R),3(R)(2(S), 3(S))-dimethylthiirane (trans-DMT) by the W(CO)sub 5} group. The reaction of an excess of thiirane with W(CO)sub 5}-(NCMe) leads to the formation of the cyclic polydisulfides (CHsub 2}-CHsub 2}SS)sub n}, 1-4, n = 2-5 plus ethylene catalytically. The case of this new catalytic thiirane reaction indicates