Mechanistic Aspects of the Alternating Copolymerization of Propene with Carbon Monoxide Catalyzed by Pd(II) Complexes of Unsymmetrical Phosphine−Phosphite Ligands
作者:Kyoko Nozaki、Naomasa Sato、Yoichi Tonomura、Masako Yasutomi、Hidemasa Takaya、Tamejiro Hiyama、Toshiaki Matsubara、Nobuaki Koga
DOI:10.1021/ja973199x
日期:1997.12.1
The reaction steps responsible for the highly enantioselective asymmetric copolymerization of propene with carbon monoxide catalyzed by a cationic Pd(II) complex bearing an unsymmetrical chiral bidentate phosphine−phosphite, (R,S)-BINAPHOS [(R,S)-2-(diphenylphosphino)-1,1‘-binaphthalen-2‘-yl 1,1‘-binaphthalene-2,2‘-diyl phosphite = L1], have been studied. Stepwise identification and characterization
负责丙烯与一氧化碳的高度对映选择性不对称共聚的反应步骤,由带有不对称手性双齿膦-亚磷酸酯的阳离子 Pd(II) 配合物催化,(R,S)-BINAPHOS [(R,S)-2-( diphenylphosphino)-1,1'-binaphthalen-2'-yl 1,1'-binaphthalene-2,2'-diyl phosphite = L1]。对催化剂前体 (SP-4-2)- 和 (SP-4-3)-Pd(CH3)Cl(L1) (1a 和 1b) 和 (SP-4-3)-[ Pd(CH3)(CH3CN)(L1)]·X1 (X1 = B3,5-(CF3)2C6H3}4) (2),以及与反应步骤相关的配合物,(SP-4-3)-[ Pd(COCH3)(CH3CN)(L1)]·X1 (3), (SP-4-3)- 和 (SP-4-4)-[PdCH2CH(CH3)COCH3}(L1)]·X1 (