The treatment of 2-benzyl-1, 2-diphenyl-2-hydroxyethanone (3a, benzylbenzoin) with potassium cyanide in DMF gave deoxybenzoin (4a). The formation of deoxybenzoin (4a) proceeds through retro-benzoin condensation by catalytic action of cyanide ion. Similarly, retro-benzoin condensation applied to several substituted benzoins 3 resulted in the formation of the corresponding ketones 4 in excellent yields.
2-苄基-1,2
-二苯基-2-羟基乙酮(3a,苄基苯偶姻)在
DMF中与
氰化钾反应生成脱氧苯偶姻(4a)。脱氧苯偶姻(4a)的形成是通过
氰离子催化的逆苯偶姻缩合反应进行的。同样,逆苯偶姻缩合反应应用于几种取代苯偶姻3时,以极佳的收率形成了相应的酮4。