alcoholysis, and by their infrared spectra. For unsymmetrical acetylenes. Markownikoff addition was demonstrated; the steric course of reaction is trans for acetylene but is believed to be cis for at least some of the substituted acetylenes. Reactivity increases with high acceptor strength of borane and high nucleophilicity of the acetylene. Chloro- and organoboration of acetylenes is evidently a thermody
选定的卤代烷酮BX 1 X 2 X 3(X 1 = Cl或Br,X 2和X 3为= X 1或Ph),通常与
乙炔(HCCH,BuCCH,PhCCH或取决于
乙炔的性质,得到(2-卤代或2-苯基烯基)
硼烷。产物的特征在于乙酰分解原脱
硼,醇解及其红外光谱。用于不对称
乙炔。展示了Markownikoff的添加;对于
乙炔来说,空间反应过程是反式的,但据信是顺式的对于至少一些取代的
乙炔。反应性随
硼烷的高受体强度和
乙炔的高亲核性而增加。与氢
硼化相反,
乙炔的
氯硼化和有机
硼化显然是热力学控制的过程。