New amino-, imino- and oxazolinophosphites based on 1,1′-bi-2-naphtol: coordination and catalytic properties
摘要:
A series of the new chiral BINOL-based phosphite P,N-hybrid ligands was prepared. The coordination behavior of all the ligands was studied and the neutral complexes [Rh(CO)Cl(P<^>N)] were synthesized in order to characterize a degree of the electronic non-symmetry of donating centers. Also the neutral and cationic complexes cis-[PdCl2(eta(2)-P<^>N=)], cis-[PdCl2(eta(1)-P<^>N=)(2)], cis-[PdCl(eta(2)-P<^>N=)(eta(1)-P<^>N=)]Cl-+(-), [Pd(allyl)(eta(2)-P<^>N=)]X-+(-) (X- = Cl-, BF4-) were obtained and characterized. The new P,N-hydrid ligands gave up to 81% ee in the enantioselective Pd-catalyzed alkylation of 3-penten-2-yl carbonate by dimethyl malonate and up to 60% ee in the Rh-catalyzed hydrosilylation of acetophenone and acetylferrocene by diphenylsilane. (C) 2002 Elsevier Science B.V. All rights reserved.
New amino-, imino- and oxazolinophosphites based on 1,1′-bi-2-naphtol: coordination and catalytic properties
摘要:
A series of the new chiral BINOL-based phosphite P,N-hybrid ligands was prepared. The coordination behavior of all the ligands was studied and the neutral complexes [Rh(CO)Cl(P<^>N)] were synthesized in order to characterize a degree of the electronic non-symmetry of donating centers. Also the neutral and cationic complexes cis-[PdCl2(eta(2)-P<^>N=)], cis-[PdCl2(eta(1)-P<^>N=)(2)], cis-[PdCl(eta(2)-P<^>N=)(eta(1)-P<^>N=)]Cl-+(-), [Pd(allyl)(eta(2)-P<^>N=)]X-+(-) (X- = Cl-, BF4-) were obtained and characterized. The new P,N-hydrid ligands gave up to 81% ee in the enantioselective Pd-catalyzed alkylation of 3-penten-2-yl carbonate by dimethyl malonate and up to 60% ee in the Rh-catalyzed hydrosilylation of acetophenone and acetylferrocene by diphenylsilane. (C) 2002 Elsevier Science B.V. All rights reserved.
A series of the new chiral BINOL-based phosphite P,N-hybrid ligands was prepared. The coordination behavior of all the ligands was studied and the neutral complexes [Rh(CO)Cl(P<^>N)] were synthesized in order to characterize a degree of the electronic non-symmetry of donating centers. Also the neutral and cationic complexes cis-[PdCl2(eta(2)-P<^>N=)], cis-[PdCl2(eta(1)-P<^>N=)(2)], cis-[PdCl(eta(2)-P<^>N=)(eta(1)-P<^>N=)]Cl-+(-), [Pd(allyl)(eta(2)-P<^>N=)]X-+(-) (X- = Cl-, BF4-) were obtained and characterized. The new P,N-hydrid ligands gave up to 81% ee in the enantioselective Pd-catalyzed alkylation of 3-penten-2-yl carbonate by dimethyl malonate and up to 60% ee in the Rh-catalyzed hydrosilylation of acetophenone and acetylferrocene by diphenylsilane. (C) 2002 Elsevier Science B.V. All rights reserved.