giving instead of the expected olefinic Wittig product the corresponding 2-phenylselenocyclohexanone (VI). The reaction pathuay has been demonstrated to involve nucleophilic substitution on selenium by the katone enolate, the leaving group being the selenium free phosphorane (I). This reaction is shown to be general for seven more ketones, thus indicating its preparative potential.
使两个α-苯基
硒代
膦酸酯(III RH或Me)与
环己酮反应,得到相应的2-苯基
硒代
环己酮(VI)代替预期的烯烃Wittig产物。已证明反应路径涉及通过烯醇烯醇盐在
硒上的亲核取代,离去基团是无
硒的
磷烷(I)。该反应显示对于另外七个酮是通用的,因此表明其制备潜力。