Mild electrophilic halogenation of chloropyridines using CCl4 or C2Cl6 under basic phase transfer conditions
作者:Ashutosh V. Joshi、Mubeen Baidossi、Nida Qafisheh、Elsa Chachashvili、Yoel Sasson
DOI:10.1016/j.tetlet.2004.04.177
日期:2004.6
Effective chlorination of 2,3,5,6-tetrachloropyridine to pentachloropyridine was realized under mild phase transfer conditions with carbon tetrachloride and 50% NaOH or solid K3PO4. Mechanistic study of this reaction indicated the possibility of an aromatic carbanionic intermediate. Hexachloroethane was established as a more selective electrophilic chlorination agent.
在温和的相转移条件下,用四氯化碳和50%NaOH或固体K 3 PO 4实现了2,3,5,6-四氯吡啶的有效氯化为五氯吡啶。该反应的机理研究表明存在芳族碳负离子中间体的可能性。建立了六氯乙烷作为更具选择性的亲电氯化剂。