Polyfluoroalkyl derivatives of nitrogen. Part XLIII. Reactions of N-bromobis(trifluoromethyl)amine with 1-fluoropropene under free-radical and under ionic conditions
作者:Robert N. Haszeldine、Ilyas-ud-D. Mir、Anthony E. Tipping
DOI:10.1039/p19760000556
日期:——
Photochemical reaction of N-bromobis(trifluoromethyl)amine with 1-fluoropropene in the vapour phase gives a mixture of the 1 : 1 adducts 2-bromo-1-fluoro-NN-bis(trifluoromethyl)propylamine and 2-bromo-2-fluoro-1-methyl-NN-bis(trifluoromethyl)ethylamine in the ratio 46 : 54. Under conditions conducive to the formation of ionic intermediates (–78 °C in the dark in the liquid phase), stereospecific anti-addition
N-溴双(三氟甲基)胺与1-氟丙烯在气相中的光化学反应产生了1:1的加合物2-溴-1-氟-NN-双(三氟甲基)丙胺和2-溴-2-氟的混合物-1-甲基-NN-双(三氟甲基)乙胺,比例为46:54 。在有利于形成离子中间体的条件下(液相中在黑暗中为–78°C),需要对烯烃进行立体定向抗加成反应位置和1∶1的加合物以90∶10(顺式-异构体)和77∶23(反式-异构体)的比例形成。所有加合物均通过反消除作用进行脱氢溴化反应,得到相应的(E)-或(Ž)α-烯烃,除了(1 - [R,2小号)-2-溴-1-氟- NN -双(三氟甲基)丙胺,其经历主要顺式β-消除,得到的混合物(ë) -和(Ž) -1-氟-NN-双(三氟甲基)丙-1-烯胺的比例为82:18。