The reaction of the molybdenum dimer [Mo2(CO)4(η-C5H5)2] with [M(CCR)(CO)2(η-C5H5)] (M = Ru or Fe, R = Me or Ph) has given different products dependent on the alkynylmetal. The ruthenium-containing starting materials gave the expected dimolybdenum alkynyl adducts as the only isolable materials in moderate yield. In contrast the iron alkynyls underwent FeâC bond cleavage to give the simple known alkyne adducts [Mo2(µ-η2-HC2R)(CO)4(η-C5H5)2] by a yet to be determined mechanism. The fluxional nature of the complex [Mo2Ru(µ-CCMe)(CO)2(η-C5H5)}(CO)4(η-C5H5)2] was observed by solution NMR studies; the mechanism for equilibration of the molybdenum carbonyl groups at room temperature must involve disruption of the central Mo2C2 core.
钼二聚体[Mo2(CO)4(δ--
C5H5)2]与[M(CCR)(CO)2(δ-- )](MÂ = Â Ru 或 Fe,RÂ = Â Me 或 Ph)的反应根据炔基
金属的不同而产生不同的产物。含
钌的起始材料产生了预期的二
钼炔基加合物,这是唯一可分离的材料,产率适中。与此相反,
铁炔基物经过 FeâC 键裂解,通过一种尚未确定的机理得到简单的已知炔加合物 [Mo2(µ-δ-2-HC2R)(CO)4(δ-- )2]。溶液核磁共振研究观察到了[Mo2Ru(µ-CCMe)(CO)2(δ-- )}(CO)4(δ-- )2]复合物的通性;
钼羰基在室温下的平衡机制必须涉及中央 Mo2C2 核心的破坏。