Solid-State Solvolysis of Thiophene-Substituted Trityl-Type Alcohols: Nucleophilic Substitution Induced by Gas−Solid Contact
作者:Motoko Tanaka、Naoki Tanifuji、Shigeru Hatada、Keiji Kobayashi
DOI:10.1021/jo001291x
日期:2001.2.1
suggested by the ESR spectrum. The mechanism involving the collapse of the radical cation to generate a proton, which acts as a catalyst to afford the carbocation, was deduced based on the electrochemical oxidation of the substrate in solution. The propagation of the substitution reaction in the solid state has been shown for the carbocation upon contact with methanol vapor. The crystalline inclusion
已经研究了通过气固接触的亲核取代反应。当将9-噻吩并噻吩芴-9-ol衍生物与二氯二氰基醌(DDQ)共研磨,然后暴露于甲醇蒸气中时,以15-70%的产率获得相应的9-甲氧基芴。在整个过程中,固态保持不变。ESR光谱表明,通过底物醇与DDQ之间的电荷转移相互作用,在共研磨的固体中生成了自由基阳离子。基于溶液中底物的电化学氧化,推导了涉及自由基阳离子分解产生质子的机理,该质子充当提供碳正离子的催化剂。对于与甲醇蒸气接触的碳正离子,已经显示出固态的取代反应的传播。将以甲醇为客体的9-噻吩并噻吩基芴-9-醇衍生物的结晶包合物暴露于HCl气体中。该气固反应还导致形成保持固态的相应甲氧基化合物。通过这项工作,得出了固态共研磨的新结果。