10448-09-6Relevant articles and documents
SYNTHESIS OF SPIROCYCLOSILOXANES BY FLASH VACUUM PYROLYSIS OF 2,7-DIMETHYL-2,3:7,8-DIEPOXY-5-SILASPIRONONANE AND CYCLOSILOXANES
Juengst, Clifford D.,Weber, William P.,Manuel, Georges
, p. 187 - 194 (1986)
Flash vacuum pyrolysis (FVP) of 2,7-dimethyl-2,3:7,8-diepoxy-5-silaspirononane with cyclotetra- or cyclopenta-siloxanes (D4 or D5) leads to products which apparently result from transannular insertion of or an equivalent synthon into Si-O single bonds of D4 or D5: 2,4,6,8,10-pentasila-1,3,5,7,9,11-hexaoxaspiroundecane (D2QD2) and 2,4,6,8,10,12-hexasila-1,3,5,7,9,11,13-heptaoxaspirotridecane (D3QD2) respectively.The scope of this reaction has been explored with substituted cyclotetrasiloxanes such as heptamethylcyclotetrasiloxane, vinylheptamethylcyclotetrasiloxane, phenylheptamethylcyclotetrasiloxane, and chloromethylheptamethylcycloterasiloxane.In all cases, substituted spirocyclosiloxane products (D2QDDx) were obtained. 29Si NMR has proved particularly useful for the assignment of structure of these spirocyclosiloxanes.