Diels–Alder reactions of polyfluorocyclohexa-1,3-dienes. Part III. Addition of alkynes, ethylene, and allene to 2H,3H-hexafluorocyclohexa-1,3-diene and reaction of some Diels–Alder adducts of octafluorocyclohexa-1,3-diene with lithium aluminium hydride
作者:W. J. Feast、W. K. R. Musgrave、R. G. Weston
DOI:10.1039/j39710000937
日期:——
8-hexafluorobicyclo[2,2,2]octa-2,5-dienes together with poly-addition products. Some of the Diels–Alder adducts of (10) may be more conveniently prepared by reaction of the analogous adducts of (14) with lithium aluminium hydride; however, where trifluoromethyl occurs as a vinylic substituent the products of this reaction are polyfluoro-5-methylenebicyclo[2,2,2]oct-2-enes. Pyrolysis of alkyne adducts
2小时,3小时-六氟环己-1,3-二烯(10),六氟-2,3-二甲基环己-1,3-二烯(7)和全氟环-1,3-二烯(14)通过1,4-加成与乙烯反应得到高产率的2,3-二取代的1,4,5,5,6,6-六氟双环[2,2,2]辛-2-烯(3),(6)和(5)。二烯(10)和(14)与丙二烯反应,得到多氟-5-亚甲基双环[2,2,2]辛-2-烯(9)和(15)。二烯(10)与炔烃反应,得到2,3-二取代的1,4,7,7,8,8,8-六氟双环[2,2,2]八-2,5-二烯以及聚加成产物。某些(10)的Diels-Alder加合物可以通过(14)的类似加合物与氢化铝锂反应而更方便地制得;然而,当三氟甲基作为乙烯基取代基出现时,该反应的产物是多氟-5-亚甲基双环[2,2,2]辛-2-烯。