Kinetics and mechanism of the reactions of bis(cyclopentadienyl carbonyl nickel) with alkynes
作者:P.L. Stanghellini、R. Rossetti、O. Gambino、G. Cetini
DOI:10.1016/s0020-1693(00)94860-6
日期:1973.1
Abstract The rates of the reaction of Cp 2 Ni 2 (CO) 2 (Cp = π-cyclopentadienyl) with alkynes are reported. The reaction proceeds by two different mechanisms, a two-stage mechanism, with first-order-rate-determining-step, and a bimolecular associative mechanism. Either on both may prevail depending on the nature, or the bulkiness of the ligand. First order path implies, more probably, the homolytic
摘要报道了Cp 2 Ni 2(CO)2(Cp =π-环戊二烯基)与炔烃的反应速率。该反应通过两种不同的机理进行,即具有一级速率确定步骤的两阶段机理和双分子缔合机理。取决于配体的性质或体积,两者均可占优势。一阶路径更可能暗示着速率确定的均相Ni-Ni裂变。二阶速率常数的值表明,在配位炔烃中,π-受体容量比σ-供体容量重要。