From a Stable Silylene to a Mixed-Valent Disiloxane and an Isolable Silaformamide-Borane Complex with Considerable Silicon-Oxygen Double-Bond Character

摘要

For a long time,unsaturated silicon compounds with multiple bonds to silicon have been thought to be unisolable at room temperature.This situation changed profoundly in 1981.During the past 25 years,intriguing progress has been achieved to generate a wealth of isolable compounds with silicon-heteroatom double bonds(heteroatom:elements from Groups 13,14,and 15,and sulfur),and more recently even isolable compounds with a silicon-silicon triple bond have been reported which represent unique and indispensable building blocks in organosilicon chemistry.