Mechanism of the Solution-Phase Reaction of Alkyl Sulfides with Atomic Hydrogen. Reduction via a 9-S-3 Radical Intermediate
作者:Dennis D. Tanner、Sudha Koppula、Pramod Kandanarachchi
DOI:10.1021/jo9615615
日期:1997.6.1
alkyl sulfide fragmentation subsequent to its reaction with atomichydrogen is indicative of a reaction that proceeds via an early transition state. The competitive reduction of a series of substituted-benzyl alkyl sulfides was insensitive to the substituent on the aromatic ring (rho = -0.13, r = 0.99). The relative rates of fragmentation of a series of the substituted-benzyl alkyl sulfides gave a
Amidothiol derivatives have the formula
wherein:
R represents an alkyl, alk-2 to 6 - enyl, phenylalkyl, phenyl or heterocyclic group optionally substituted by one or more functional groups inert to electrochemical oxidation:
R1, R2, R3 and R4 independently represent hydrogen or substituent groups, and r5 represents alkyl, phenylalkyl or phenyl. The derivatives are useful in the preparation of pharmaceutically active compounds and dyestuffs and have herbicidal and/or antibacterial activity. The compounds can be prepared by electrochemical oxidation of a corresponding organic disulphide in the presence of the corresponding alkene and the corresponding organic nitrite, and treatment of the reaction product with water.
酰胺硫醇衍生物的化学式为
其中
R 代表烷基、烷-2-6-烯基、苯基烷基、苯基或杂环基团,可任选被一个或多个电化学氧化惰性官能团取代:
R1、R2、R3 和 R4 分别代表氢或取代基,r5 代表烷基、苯基烷基或苯基。这些衍生物可用于制备医药活性化合物和染料,并具有除草和/或抗菌活性。这些化合物的制备方法是:在相应的烯烃和相应的有机亚硝酸盐存在下,对相应的有机二硫化物进行电化学氧化,然后用水处理反应产物。
The Regioselective Reaction of Atomic Hydrogen with Unsymmetric Disulfides and Sulfides
作者:Dennis D. Tanner、Liying Zhang、Markandu Vigneswaran、Pramod Kandanarachchi
DOI:10.1021/jo00119a027
日期:1995.7
Unsymmetric disulfides undergo solution phase reduction with atomic hydrogen regioselectively by displacement at the least hindered sulfur atom. The cleavage of the sulfur-sulfur bond forms mixtures of two thiol and two thiyl radicals. At the temperature at which the reactions are carried out, the thiyl radicals form symmetric disulfides by thiyl-thiyl radical coupling and not by thiyl radical displacement on the starting material. The reaction of atomic hydrogen with an unsymmetric sulfide is a cleavage that favors the formation of the most stable radical. The reaction of phenyl cyclohexyl sulfide produces benzene, cyclohexane, cyclohexyl thiol, and thiophenol. Benzene and cyclohexyl thiol produced from the cleavage of the phenyl-sulfur bond are proposed to arise from the ct-scission of an intermediate formed by ipso-addition of atomic hydrogen to the benzene ring.