Platinum-Catalyzed Acrylonitrile Hydrophosphination. P−C Bond Formation via Olefin Insertion into a Pt−P Bond
作者:Denyce K. Wicht、Igor V. Kourkine、Ivan Kovacik、David S. Glueck、Thomas E. Concolino、Glenn P. A. Yap、Christopher D. Incarvito、Arnold L. Rheingold
DOI:10.1021/om990745h
日期:1999.12.1
independently and found to be stable to P−C reductive elimination. Instead, catalysis appears to occur by selective insertion of acrylonitrile into the Pt−P bond to yield the alkyl hydrides Pt(diphos)[CH(CN)CH2PRR‘](H), followed by C−H reductive elimination and regeneration of 1 or 2. This insertion was observed directly in model methyl phosphido complexes M(dppe)(Me)(PRR‘) (M = Pt, R = H, R‘ = Mes* (12),
丙烯腈配合物Pt(diphos)(CH 2 CHCN)(diphos = dppe(1),dcpe(2); dppe = Ph 2 PCH 2 CH 2 PPh 2,dcpe = Cy 2 PCH 2 CH 2 PCy 2,Cy =环-C 6 H 11)是催化剂的前体,并且对于某些底物而言,处于在丙烯腈的C C双键上的伯膦和仲膦中加成P-H键的过程中(氢磷酸化),处于静止状态。将P-H键氧化添加到相关的催化剂前体上可得到磷氢化物络合物Pt(diphos)(PRR')(H)(diphos = dppe,R = H,R'= Mes *(20),R = R'= Mes(21); diphos = dcpe,R = H,R'= Mes *(22);Mes = 2,4,6-Me 3 C 6 H 2,Mes * = 2,4,6-(t -Bu)3 C 6 H 2)。丙烯腈不会插入这些氢化物的Pt-H键中