Reaction Search and Function Development for the Unsaturated Bonding Systems between Transition Metals and Heavier Group 14 Elements

我们发现，对于钨或Ru与硅或锗之间具有双键或三键的配合物，取代基空间位阻的减少导致金属-14族元素不饱和键的反应活性显著增强，它们与各种有机分子的反应进行得很顺利。特别是首次阐明了钨-锗三键对有机分子的反应性。我们还证明了η、3-α-硅苯基钨钼络合物是硅烯络合物和配位不饱和络合物的合成等价物。

We found that, with regard to the complexes having a double or triple bond between tungsten or ruthenium and silicon or germanium, reduction of the steric hindrance of substituents caused the dramatic enhancement of reactivity of the metal-Group 14 element unsaturated bond, and their reactions with various organic molecules proceeded smoothly. Especially, we clarified the reactivity of the tungsten-germanium triple bond toward organic molecules for the first time. We also demonstrated that η^3-α-silabenzyl tungsten and molybdenum complexes serve as the synthetic equivalents of both silylene complexes and coordinatively unsaturated complexes.