Transition-Metal Catalyzed Disilane Metathesis Reaction of Organosilicon Compounds

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We found that cyclic disilanes such as 1,2-Disilacyclobutanes underwent palladium-catalyzed Si-Si metathesis to from a dimer (Organometallics, 14,2556(1995)). It was considered which types of cyclic disilanes lead to the Si-Si metathesis reaction as well as a new versatile snthetic method of cyclic disilanes. For the preparation of 1.2-disilacyclobutane, new zirconocene promoted alkyne-coupling reaction of 1,2-alkynyldisilane have been discolsed. However bulky alkoxy groups as erminal substituents of alkynes, which is essential for the zirconocene cpoupling reaction, disturbed the Si-Si metathesis reaction with Pd(PPh3)4 and Pd(CNtBu)2 to afford bissilylpalladium complexes respectively. Furthermore, bissilylpalladium complex react with activated acetylene to give bissilylation products, while the reaction with CpPdAllyl led to the intramolecular sily Heck reaction