The preparation of several vinyl sulfides, selenides and tellurides by Wittig-type reaction in a one-pot procedure is described. The chalcogenyl triphenylphosphoranes 3 are formed "in situ" by the reaction of chloromethyl phenyl chalcogenide, potassium tert-butoxide and triphenylphosphine. Reaction of 3 with carbonyl compounds afford the vinyl chalcogenides 6-9 with preferential Z-configuration.
描述了一种通过Wittig类型反应在一步法中制备几种
乙烯基硫化物、
硒化物和
碲化物的方法。通过
氯甲基
酚类卤化物、叔丁氧化
钾和三苯基
磷的反应“原位”形成了
硫族
三苯基膦化合物3。化合物3与羰基化合物反应,得到优先为Z-构型的
乙烯基硫族化合物6-9。