SILICON COMPOUNDS WITH STRONG INTRAMOLECULAR STERIC INTERACTIONS .63. SILYLENE REACTION WITH SELENOPHENE AND A TELLUROPHENE - FORMATION AND STRUCTURES OF A 1,3-DISELENA-2,4-DISILETANE AND A 1,3-DITELLURA-2,4-DISILETANE [German]

摘要

Di-tert-butylsilylene, generated by photolysis of hexa-tert-butylcyclotrisilane, reacts with selenophene or 2,5-dimethyltellurophene by chalcogen abstraction to furnish the 1,3-diselena-2,4-disiletane 6 and 1,3-ditellura-2,4-disiletane 7 ring systems. The X-ray structure analyses of 6 and 7 reveal strictly planar four-membered rings with the smaller endocyclic angles at the chalcogen and the larger angles at the silicon atoms. [References: 23]