Oligomeric polyparatetrafluorophenylene vinylenes: a new synthesis based on the nucleophilic substitution of the para fluorine during the reaction of (E)-2-(pentafluorophenyl)ethenyl lithium with hexafluorobenzene
作者:Gerald M. Brooke、Simon D. Mawson
DOI:10.1016/s0022-1139(00)82183-1
日期:1990.10
(E)-2-(Pentafluorophenyl)ethenyl bromide (3) has been prepared by three routes: (i) bromination of 2,3,4,5,6-pentafluorocinnamic acid (5) gave 1,2-dibromo-2-(pentafluorophenyl)propionic acid (6) which was converted into 1,1,2-tribromo-2-(pentafluorophenyl)ethane (7) via the Hunsdiecker reaction; (3) was formed by the debromination of (7) with zinc; (ii) the reaction of (6) with red mercuric oxide and
(E)-2-(五氟苯基)乙烯基溴化物(3)已通过三种途径制备:(i)将2,3,4,5,6-五氟肉桂酸溴化(5),得到1,2-二溴-2- (五氟苯基)丙酸(6),其通过Hunsdiecker反应转化为1,1,2-三溴-2-(五氟苯基)乙烷(7);(3)由(7)与锌脱溴而形成;(ii)(6)与红色氧化汞和溴的反应得到(3)和(7);(iii)将2,3,4,5,6-五氟苯基乙炔(8)与儿茶酚硼烷加氢硼化,然后将中间体水解,得到(E)-2-(五氟苯基)乙烯基硼酸(9),将其用碱和溴处理给出(3)。用碱和碘将硼酸(9)转化为(E)-2-(五氟苯基)乙烯基碘(4)。溴化合物(3)对镁无活性,正丁基锂导致氟取代,得到(10)。碘化合物(4)与正丁基锂在C反应中形成锂衍生物(11)。6 F 6得到(E)-十氟fluoro(12)和低聚化合物(13),(14)和(15);在不存在C 6 F 6的情况下,形成电导率<10