Aromatic polyfluoro-compounds. Part XLVII. The reactions of pentafluorophenyl-lithium with halogeno-olefins
作者:D. D. Callander、P. L. Coe、J. C. Tatlow、R. C. Terrell
DOI:10.1039/j39710001542
日期:——
Pentafluorophenyl-lithium has been treated with a number of halogeno-olefins of the type CXYCFZ (X, Y, Z, being F, Cl, Br or H). When the olefins were CF2CFCl and CF2CCl2 the products isolated were C6F5CFCFCl and C6F5CFCCl2 together with derivatives formed by nucleophilic attack of C6F5Li on the polyfluoroaryl ring. The orientation of this attack was shown by chemical and spectroscopic methods to be
五氟苯基锂已用多种CXY CFZ类型的卤代烯烃(X,Y,Z为F,Cl,Br或H)处理过。当烯烃为CF 2 CFCl和CF 2 CCl 2时,分离的产物为C 6 F 5 CF CFCl和C 6 F 5 CF CCl 2以及通过C 6 F 5 Li亲核攻击多氟芳基环而形成的衍生物。化学和光谱学方法表明这种攻击的方向在4位。但是,如果烯烃为CFCl,CFCl或CF 2形成CHCl,氯五氟苯基乙炔。当CF 2 CFH或CF 2 CFBr是烯烃C 6 F 5 C CC 6 F 5时,会分离出其进一步的五氟苯基取代的衍生物,例如C 6 F 5– C 6 F 4 C CC 6 F 5。已经提出了一种机制来解释这些结果。还描述了溶剂和卤化锂对反应过程的影响。