Disilaoxiranes: Synthesis and Crystal Structure

摘要

Reaction of tetraaryldisilenes with N2O produces tetraaryldisilaoxiranes, R4Si2O where R = mesityl, 2,6-xylyl and 2,6-dimethyl-4-tert-butylphenyl. The crystal structure of tetramesityldisilaxirane (2a) has been determined by x-ray crystallography. The sum of bond angles C-Si-Si', C-Si-C' and C'-Si-Si' at each silicon is 360, and the Si-Si distance is very short, 222.7 pm. These results suggest that bonding in the disilaoxirane structure may be regarded as intermediate between a disilene-oxygen pi-complex and a three-membered ring.