PH-Phosphines react with aromatic aldehydes in an alcohol under P-C-O-bond formation to give α-alcoxy benzylphosphines R2P-CH(Ph)-OR' or R-P[CH(Ph)-OR']2 resp. In case of 4-dimethylaminobenzaldehyde or 2,4-dimethoxybenzaldehyde with diphenylphosphine or phenyl-benzylphosphine benzylidenediphosphine of the type (RR'P)2CH-C6H4NMe2 and (RP'P)2CH -C6H3(OMe)3 are obtained. The phosphines prepared are characterized
PH膦在
PCO键形成下与醇中的芳香醛反应,生成α-烷
氧基
苄基膦R 2 P-CH(Ph)-OR'或RP [CH(Ph)-OR'] 2。对于4-
二甲氨基苯甲醛或
2,4-二甲氧基苯甲醛与(RR'P)2 CH-C 6 H 4 NMe 2和(RP'P)2 CH -C 6 H 3(获得OMe)3。所制备的膦的特征在于其
水解和
氧化行为以及and盐的形成。化合物的结构由其1阐明1 H NMR谱。讨论了两种情况下涉及
碳正离子过渡态的反应途径。