Organic Substituted Cyclosilanes

Diene-Iron Carbonyl Complexes and Related Species R. Pettit and G. F. Emerson Reactions of Organotin Hydrides with Organic Compounds Henry C. Kuivila Organic Substituted Cyclosilanes... 

One other organic substituted cyclosilane has been reported in the Utera-ture. Burkhard prepared dodecamethylcyclohexasilane (9) by the reaction of dichlorodimethylsilane with sodium in hydrocarbon solvents. Under these conditions, the cyclosilane was formed in low yield along with polymeric materials, one of which was characterized as a dimethylsilylene polymer with an average degree of polymerization of 55 units. ... 

Another organic substituted cyclosilane has been prepared by the reaction of 1,5-dilithiodecaphenylpentasilane with dichlorodimethylsilane. The resulting product, 1,1-dimethyldecaphenylcyclohexasilane (10), which might be a possible analog of Compound C, is characterized by its high... 

In general, all of the organic substituted cyclosilanes have been prepared by the reaction of a dichlorodiorganosilane with lithium, sodium, or magnesium, using various solvents. The perarylated cyclosilanes were first prepared by F. S. Kipping by the action of sodium ondichlorodiphenylsilane... 

Organic substituted cyclosilanes generally undergo reactions which are common to organodisilanes, though considerations such as ring size and steric limitations may be important. 

Halogenation of the organic substituted cyclosilanes has also been used extensively in characterization of these compounds and to provide silicon-functional compounds for further studies. Octaphenylcyclotetrasilane has... 

Through the reaction of 1,5-dilithiodecaphenylpentasilane with di-chlorodimethylsilane, another example of an organic substituted cyclosilane was realized. 1,1-Dimethyldecaphenylcyclohexasilane (10) is obtained in about 30% yield from this reaction. Attempts to prepare dodecaphenyl-... 

The intensive study of the reactions of the organic substituted cyclosilane, dodecamethylcyclohexasilane, has only recently begun. However, to be as complete as possible in discussing the chemistry of cyclosilanes, a few reactions of this compound will be discussed with the reservation that the results presented are, at this point, tentative. 

Representative organic substituted cyclosilanes, as illustrated by octa-phenylcyclotetrasilane (5), decaphenylcyclopentasilane (6), and their p-tolyl analogs (7 and 8), and dodecamethylcyclohexasilane (9), have been characterized and shown to undergo reactions which are generally common to compounds containing the disilane linkage. The relative reactivities of these cyclosilanes has been attributed mainly to steric factors and substituent... 

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