SILAETHENE. VIII. GASPHASEN-PYROLYSE Si-HALOGENIERTER SILACYCLOBUTANE

Article abstract of DOI:10.1016/S0022-328X(00)89014-2

The gasphase pyrolysis of Si-halogenated silacyclobutanes (I), (II), (III), (IV), (VI) and (VII) has been studied under varying conditions (temperature, pressure, reaction-time) and has been compared with the electron beam fragmentation in a mass spectrometer.In case of the monosilacyclobutanes the first reaction step is the cleavage of the ring system with formation of ethylene and silaethenes, which undergo different secondary reactions (head to tail, head to head recombination, HX-addition) depending on the reaction conditions.The interpretation of the pyrolysis pathways is supported by low temperature IR measurements and mass spectroscopic investigations of the starting compounds and pyrolysis products.