Polyfluoro-compounds based on the cycloheptane ring system. Part 5. Octafluordcyclohepta-1,3,5-triene and hexafluorotropone
作者:D.J. Dodsworth、C.M. Jenkins、R. Stephens、J.C. Tatlow
DOI:10.1016/s0022-1139(00)81295-6
日期:1984.1
be dehydrofluorinated, either by bubbling through molten potassium hydroxide or, better, with powdered alkali in an inert medium. Unless special precautions were taken, such reactions yielded hexafluorotropone. With care however the primary product, octafluorocyclohepta-l,3,5-triene, could be isolated, but it was hydrolysed rapidly, even by water, to give the tropone. Isomerisations and pyrolytic dehydrofluorinations
十氟环庚-1、3-二烯与硼氢化钠进行还原加成消除反应,主要得到1H-九氟环庚-1,3-二烯以及次要产物1H,4H-八氟类似物,最重要的是5H-九氟环庚七- l,3-二烯。十氟环庚-1,4-二烯类似地主要得到1H-和2H-九氟环庚-1,4-二烯的混合物,以及一些6H-九氟环庚-1,4-二烯和痕量的5H-1,3-二烯。最后两个二烯是重要的产物,在烯丙基碳上具有氢。可以通过在熔融的氢氧化钾中鼓泡,或者最好在惰性介质中用粉状碱将它们脱氟化氢。除非采取特殊的预防措施,否则此类反应会产生六氟托酮。但是要小心,主要产物八氟环庚-1、3,5-三烯,可以分离出来,但是即使被水迅速水解也可以得到托克酮。进行了主要还原产物的异构化和热解脱氟化氢反应,但均未产生三烯或对苯二酚。似乎三烯可能形成了,但分解生成了全氟芳烃。一个有趣的脱氟途径也正在运行,得到五氟苯。2 H-Nonafluorocyclohepta-1,