Reduction of π-Bound Nitriles to π-Bound Imines in a Tungsten(II) Bis(acetylacetonate) Coordination Sphere
摘要:
Addition of MeOTf (OTf = CF3SO3) to complexes of the type W(CO)(acac)(2)(eta(2)-N=CR) (acac = acetylacetonate) [R = Ph (1a), Me (1b)] yields cationic iminoacyl triflate salts of the type [W(CO)(acac)2(17 mu(2)-MeN=CR)][OTf]. Complexes 2a and 2b undergo nucleophilic attack at the iminoacyl carbon with Na[HB(OMe)(3)] or MeMgBr to form neutral 772-imine complexes of the type W(CO)(acac)(2)[eta(2)- MeN=C(Nuc)R] [Nuc = H (3a, 3b), Me (4)]. Hydride addition to 2b results in W(CO)(acac)(2)(eta(2)- MeN=CHMe), 3b, a complex that exhibits interconversion of diastereomers at ambient temperature on the NMR time scale. X-ray structures of cationic iminoacyl complex 2a and neutral imine complex 4 confirm eta(2)-C=N bonding of both the iminoacyl and imine ligands.
Reduction of π-Bound Nitriles to π-Bound Imines in a Tungsten(II) Bis(acetylacetonate) Coordination Sphere
摘要:
Addition of MeOTf (OTf = CF3SO3) to complexes of the type W(CO)(acac)(2)(eta(2)-N=CR) (acac = acetylacetonate) [R = Ph (1a), Me (1b)] yields cationic iminoacyl triflate salts of the type [W(CO)(acac)2(17 mu(2)-MeN=CR)][OTf]. Complexes 2a and 2b undergo nucleophilic attack at the iminoacyl carbon with Na[HB(OMe)(3)] or MeMgBr to form neutral 772-imine complexes of the type W(CO)(acac)(2)[eta(2)- MeN=C(Nuc)R] [Nuc = H (3a, 3b), Me (4)]. Hydride addition to 2b results in W(CO)(acac)(2)(eta(2)- MeN=CHMe), 3b, a complex that exhibits interconversion of diastereomers at ambient temperature on the NMR time scale. X-ray structures of cationic iminoacyl complex 2a and neutral imine complex 4 confirm eta(2)-C=N bonding of both the iminoacyl and imine ligands.