The Regioselective Reaction of Atomic Hydrogen with Unsymmetric Disulfides and Sulfides
摘要:
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.
We report herein a one-pot synthesis of unsymmetrical disulfides with trichloroisocyanuricacid (TCCA) as an oxidant. Under facile conditions, aromatic-aromatic disulfides and aromatic-aliphatic disulfides were synthesized in good to excellent yields even without base. For the construction of the challenging aliphatic-aliphatic disulfides, good yields of the desired products were also obtained with
Beckwith, Athelstan L. J.; Duggan, Sandhya A. M., Journal of the Chemical Society. Perkin transactions II, 1994, # 7, p. 1509 - 1518
作者:Beckwith, Athelstan L. J.、Duggan, Sandhya A. M.
DOI:——
日期:——
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.
Ground solid permanganate oxidative coupling of thiols into symmetrical/unsymmetrical disulfides: selective and improved process
作者:Ngan-Giang Thi Nguyen、Xuan-Triet Nguyen、Ngoc-Huy Nguyen、Thi Xuan Thi Luu、Xuan-Tien Dao
DOI:10.1080/17415993.2022.2083914
日期:2022.11.2
The oxidation of thiols to the symmetrical disulfides by using ground solid potassium permanganate under mild and solvent-free conditions has allowed us to selectively oxidize thiols in the presence of other readily oxidized functional groups such as alcohol, aldehyde, amine and alkene without the risk of producing undesired products via competitive oxidation reactions. Unsymmetrical disulfides have