Longchained and SO3H‐functionalized ionic liquids derived from pyrrolidine were employed as metal‐free, efficient and recyclable catalyst for thiolation of alcohols with several kinds of thiols, providing up to 99 % yield within 0.25 h at room temperature.
diethylmercaptal, benzophenone diethylmercaptole, ethyl orthotrithioformate and benzyl methylsulfide, react with copper(II) salts of 1,3-dicarbonyl compounds, active methylene compounds or anisole, in the presence of cupric chloride, to give condensation or substitution products in good yields accompanied with carbon-sulfur bond cleavage. On the other hand, in the absence of cupric chloride, the bivalent
发现二价硫化合物如苯甲醛二乙基硫醇、二苯甲酮二乙基硫醇、原三硫代甲酸乙酯和苄基甲硫醚在氯化铜存在下与1,3-二羰基化合物、活性亚甲基化合物或苯甲醚的铜(II)盐反应,以良好的收率得到缩合或取代产物,并伴有碳硫键断裂。另一方面,在不存在氯化铜的情况下,二价硫化合物不发生反应,原料被回收。这些结果可以通过假设从二价硫化合物和铜 (II) 初始形成活性络合物来解释。
Partial Reduction of Dithioacetals with Phosphorus Reagents
dithioacetals 1 derived from di- and monoaryl ketones were monodesulfurized with diphosphorus tetraiodide or dimethyl phosphonate. A side product 5 from the reaction of 9,9-bis(ethylthio)-9H-fluorene with phosphorus triiodide suggested the intermediacy of an anionic species.