| Abstract
| - tBu2Si: and tBu2SiSitBu2, generated by photolysis of (tBu2Si)3, react with the C−C triple bonds of an octa-1,3,5,7-tetrayne to furnish the cycloaddition products 7 and 8. Upon prolonged irradiation, 8 rearranges to a bicyclo[2.2.0]hexadiene with terminal silirene groups.
- Tetra-tert-butyldisilene and di-tert-butylsilylene (1), generated by photolysis of hexa-tert-butylcyclotrisilane, react with 1,8-di-tert-butylocta-1,3,5,7-tetrayne to furnish a C−C-linked bis(disilacyclobutene)derivative with terminal alkynyl groups 7 and a quatersilirene 8 by addition of 1 to all C−C triple bonds. Uponprolonged irradiation, 8 rearranges partly to the 2,5-disilabicyclo[2.2.0]hexa-1(6),3-diene with terminal silirene groups 9. The structures of 7, 8, and 9 weredetermined by X-ray crystallography.
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