ChemInform Abstract: Silicon Compounds with Strong Intramolecular Steric Interactions. Part 58. Reactions of a Disilene and a Silylene with Cyclopentadiene, Furan, and Thiophene: (2 + 4)-Cycloadditions versus Chalcogen Abstraction.
Abstract
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ChemInform Abstract
In comparison to the photolysis of cyclotrisilane (II) (generating the corresponding disilene and silylene) in the presence of cyclopentadiene (I) or furan (V), the corresponding reaction in the presence of thiophene (IX) follows a completely different course. Whereas reaction with cyclopentadiene (I) provides (2 + 4)- cycloaddition product (III) (isolated together with a 1:1 mixture of regioisomeric cyclopentadienyldisilanes and an unidentified reaction product) and reaction with furan (V) yields the double (2 + 4)- and (2 + 1)-cycloaddition product (VI), reaction with thiophene (IX) gives the sulfur abstraction product (X). Investigation of the photolysis of cyclotrisilane (II) in the presence of other five-membered heterocyclic compounds is of interest.
