Fused Tricyclic Disilenes with Highly Strained Si[BOND]Si Double Bonds: Addition of a Si[BOND]Si Single Bond to a Si[BOND]Si Double Bond


  • This work was supported in part by the Ministry of Education, Culture, Sports, Science, and Technology of Japan (Specially Promoted Research, No. 17002005).


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Internal fusion: The stable fused tricyclic tetraalkyl disilenes cis-1 and trans-1 were synthesized as yellow and red-purple crystals, respectively (see picture). X-ray analysis has shown that the geometry around the Si[DOUBLE BOND]Si bond in trans-1 is unusually distorted, but is rather normal in cis-1. Disilene trans-1 isomerizes stereospecifically to a tetracyclic isomer by unprecedented addition of a Si[BOND]Si single bond to a Si[BOND]Si double bond.