Novel Reaction Course of Thiiranes to Vinyloxiranes: Reaction of Benzyne with Thiiranes and Aldehydes
作者:Kentaro Okuma、Yuxuan Qu、Noriyoshi Nagahora
DOI:10.3987/com-21-14465
日期:——
Reaction of 2 molar amount of 2-(trimethylsilyl)phenyl triflate with thiiranes and aldehydes in the presence of CsF afforded vinyloxiranes in one-pot operation. Reaction of benzyne with thiiranes gave the corresponding alkenyl phenyl sulfides, which further reacted with another molar of benzyne to afford sulfonium ylide intermediates. Further treatment of aldehydes gave the corresponding vinyloxiranes
t-Butyl thioates are proposed as a convenient protecting group for carboxylicacids, because their deprotection under neutral condition can be attained by electro-oxidation using salts as electrolytes in aqueous acetonitrile.
tert-Butyl Cation Formation in the Hydrolysis of 2-Methyl-2-propanesulfonyl Chloride, the Simplest Tertiary Alkanesulfonyl Chloride
作者:James F. King、Joe Y. L. Lam、Vinod Dave
DOI:10.1021/jo00114a036
日期:1995.5
Evidence is presented that the only significant reaction of 2-methyl-2-propanesulfonyl chloride (1) (a) in water over the pH range 3.5-13.0 or (b) in methanol-chloroform-d is an ionization to the tert-butyl cation (2) and the chlorosulfite anion (ClSO2-), followed by further reactions of these species. The organic products include isobutylene (3), tert-butyl chloride (4a), tert-butyl alcohol (4b), and, at high pH, 2-methyl-2-propanesulfinate anion (6) and small amounts of 2-methyl-2-propanesulfonate anion (5). In the presence of barium chloride the rate of hydrolysis of 1 is constant over the pH range 3.5-12.0.