摘要:
Preparation of acyl chloride, ester, amide or thioester-substituted eta(3)-butadienyl complexes of the type [MCl(CO)(2)(eta(3)-CH2C(COXR)C=CH2)(L-2)] (M = Mo,W; XR = Cl, OR, NHR, SR; L-2 = 1,10-phenanthroline (phen), 2,9-dimethyl-1,10-phenanthroline) from 1,4-dichloro-2-butyne and Ph4P[MCl(CO)(3)(L-2)] in water resulted in improved yields (M = Mo) and recycling of reagents. Whilst analogous reactions in anhydrous methanol to yield either substituted eta(3)-butadienyl (XR = OR) or eta(3)-allyl [MoCl(CO)(2)(eta(3)-CH2C(CO2R)C(OR)Me)(phen)] were dependent upon the presence of organic bases or ethers, reactions in propanol or butanol gave the eta(3)-butadienyl complexes only. Possible mechanisms are discussed. Halide extraction from ester or amide butadienyl complexes in hydroxylic solvents gave highly reactive cations of the type [Mo(CO)(2)(eta(3)-butadienyl)(phen)(solvent](+), and carboxylate products were obtained by displacement of metal-bound solvent by glucuronate or hydroxybutyrate ions. (C) 2004 Elsevier B.V. All rights reserved.