α,β-Dibromo-β-diethoxyphosphinylalkane (2) was obtained as a stereo-isomeric mixture (erythro : threo=50 : 50) by the bromination of β-diethoxyphosphinyl-α-alkene, composed of the E-isomer and the Z-isomer (50 : 50). It was found that the reaction of 2 with sodium azide proceeded stereoselectively to give only the. E-isomer of α-bromo-β-diethoxyphosphinyl-α-alkene, which could then be converted into
α,β-二
溴-β-二乙氧基膦基
烷烃 (2) 是通过 β-二乙氧基膦酰基-α-烯烃的
溴化反应获得的立体异构混合物(赤型:苏型 = 50 : 50),由 E-异构体和 Z -异构体(50:50)。发现 2 与
叠氮化
钠的反应立体选择性地进行,只得到 。α-
溴-β-二乙氧基膦酰基-α-烯烃的 E-异构体,然后可以转化为 α-
叠氮基-β-二乙氧基膦酰基-α-烯烃 (4) 和 α-
叠氮基-β-二乙氧基膦酰基-β-烯烃,其构型由
磷原子和
乙烯基质子之间的耦合常数决定。此外,4的辐照产生了一种新型的β-二乙氧基膦酰基-α-烯烃-α-
亚胺,随后重排成相应的腈。