Clifford D. Juengst, W. Weber, G. Manuel
Jul 8, 1986
Citations
0
Influential Citations
9
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract Flash vacuum pyrolysis (FVP) of 2,7-dimethyl-2,3 : 7,8-diepoxy-5-silaspiro[4.4]-nonane with cyclotetra- or cyclopenta-siloxanes (D 4 or D 5 ) leads to products which apparently result from transannular insertion of [OSiO] or an equivalent synthon inti SIO single bonds of D 4 or D 5 : 2,4,6,8,10-pentasila-1,3,5,7,9,11-hexaoxaspiro[5.5]undecane (D 2 QD 2 ) and 2,4,6,8,10,12-hexasila-1,3,5,7,9,11,13-heptaoxaspiro[5.7]tridecane (D 3 QD 2 ) respectively. The scope of this reaction has been explored with substituted cyclotetrasiloxanes such as heptamethylcyclotetrasiloxane, vinylheptamethylcyclotetrasiloxane, phenylheptamethylcyclotetrasiloxane, and chloromethylheptamethylcyclotetrasiloxane. In all cases, substituted spirocyclosiloxane products (D 2 QDD x ) were obtained. 29 Si NMR has proved particularly useful for the assignment of structure of these spirocyclosiloxanes.