cis- and trans- Isomers of derivatives of 3-halogenoacrylic acids undergo nucleophilic displacement reactions with triphenylphosphine, tri-n-butylphosphine, and triethyl phosphite to produce the correspondingtrans-vinyl-phosphonium salts and -phosphonates exclusively. 1H n.m.r.spectra are reported for these compounds. The mechanism of the displacement reaction is discussed.
3-卤代
丙烯酸衍
生物的顺式和反式异构体与
三苯基膦,三
正丁基膦和
亚磷酸三乙酯进行亲核取代反应,仅生成相应的反式-
乙烯基-盐和-
膦酸酯。据报道这些化合物的1 H nmr光谱。讨论了置换反应的机理。