1-Fluoro-1-phenylethene (1a) or 1-(4-chlorophenyl)-1-fluoroethene (1b) and 2-fluorooct-1-ene (4), on reaction with chloroform and sodium hydroxide, in a two-phase system in the presence of a phase transfer catalyst, gave the corresponding dichlorocyclopropanes in good yields. In a competition experiment, 1a was shown to be slightly more reactive than styrene itself. AM1 calculations predict reasonable activation barriers for these reactions although the relative reactivity observed in the experiment is not reproduced. For the (E)- and (Z)-1-fluoro-2-phenylethenes (3), higher activation barriers were calculated, in agreement with the observation that these alkenes did not react with dichlorocarbene under these conditions. The dibromocarbene addition to 1a gave 1,1-dibromo-2-fluoro-2-phenylcyclopropane (8), which on heating with silver salts in acetic acid yielded 3-acetoxy- 2-bromo-1-fluoro-1-phenylprop-1-ene (9) by a cyclopropyl-allyl rearrangement.
1-氟-1-苯基乙烯(1a)或1-(4-氯苯基)-1-氟乙烯(1b)和2-氟辛-1-烯(4),在相转移催化剂的存在下,在氯仿和氢氧化钠的两相体系中反应,产生相应的二氯环丙烷收率良好。在竞争实验中,1a比苯乙烯本身稍微更具反应性。AM1计算预测这些反应的合理活化能壁垒,尽管实验中观察到的相对反应性没有被重现。对于(E)-和(Z)-1-氟-2-苯基乙烯(3),计算出了更高的活化能壁垒,与这些烯烃在这些条件下不与二氯卡宾反应的观察结果相一致。对1a的二溴卡宾加成产生了1,1-二溴-2-氟-2-苯基环丙烷(8),在乙酸银盐加热下,通过环丙基烯丙基重排生成3-乙酰氧基-2-溴-1-氟-1-苯基丙烯(9)。