Polyfluorocycloalkenes. Part XVII. Further preparations of alkoxy-nonafluorocyclohexenes and their pyrolyses to polyfluorocyclohEx-2-enones
作者:Raymond G. Plevey、David J. Sparrow、John Colin Tatlow
DOI:10.1016/s0022-1139(00)80979-3
日期:1984.12
the corresponding 1- and 3-alkoxy-nonafluorocyclohexene (roughly 3:1). Pyrolysis of the 1-(2-methoxyethoxide) over glass or alumina at 520°C gave octafluorocyclohex-2-enone. This was obtained also in good yield by pyrolysis of the known 1-ethoxy- and 1-(2-acetoxyethoxy)- analogues. From the other 1-alkoxides the same enone was formed, but accompanied by other products: from the 1-(2-bromoethoxide),
十氟环己烯与取代的乙醇(HOCH 2 CH 2X:X = Cl,Br,I和OMe)分别给出相应的1-和3-烷氧基-九氟环己烯的混合物(约3∶1)。1-(2-甲氧基乙醇)在玻璃或氧化铝上于520℃热解,得到八氟环己-2-烯酮。通过已知的1-乙氧基和1-(2-乙酰氧基乙氧基)类似物的热解也可以高收率获得。由其它的1-烷氧化物形成了相同的烯酮,但伴随着其他产物:由1-(2-溴乙氧化物),九氟环己-1-烯基乙烯基醚和3-溴七氟环己-2-烯酮;由1-(2-碘乙氧基),乙烯基醚和2-氯七氟环己基-2-烯酮制得;在395°C时从1-(2-碘乙氧基)生成6,6,7,7,8,8,9,9-八氟-2-氧杂双环[4,3,0] nona-1(5),3 -服务。在较低的温度下热解得到许多未反应的1-醇盐,但是没有检测到重排成3-醇盐。相比之下,3-乙氧基和3-(1-溴乙氧基)-异构体在390℃下更大程度地分解,得到八