SILOXANES AS SOURCES OF SILANONES

Pyrolysis of hexamethyldisiloxane (HMDS) and its copyrolysis with chlo rotrimethylsilane and tetrachlorosilane were studied. Based on the dat a of GLC analysis and on the mass spectrum of the condensate obtained after the pyrolysis of HMDS, it was concluded that HMDS acts as a sour ce of dimethylsilanone. The results of the copyrolysis of HMDS with ch lorotrimethylsilane used as a trapping reagent indicate that the dimet hylsilanone generated from HMDS can be inserted into the Si-Cl and Si- O bonds. In the copyrolysis of HMDS with tetrachlorosilane serving as a trapping reagent for dimethylsilanone, both dimethylsilanone and dic hlorosilanone are generated.