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Results of the investigations in recent years on the gas phase thermal reactions of both inorganic and organic silylenes have been correlated. Particular attention has been paid to the sources used for generation of these unstable intermediates and also to methods of obtaining and to the properties of cyclic silylenes. The bibliography contains 62 references.

Results of the investigations in recent years on the gas phase thermal reactions of both inorganic and organic silylenes have been correlated. Particular attention has been paid to the sources used for generation of these unstable intermediates and also to methods of obtaining and to the properties of cyclic silylenes. The bibliography contains 62 references.

The results of studies on the synthesis of organosilicon heterocyclic compounds under the influence of high temperatures in a flow system at atmospheric pressure and in a high vacuum are surveyed. The preparative possibilities of the gas-phase thermal method for the synthesis of new or previously difficult to obtain mono-, bi-, and poly-cyclic compounds with one or several silicon atoms in the ring are examined. The principal aspects of the thermal heterocyclisation processes are described. Attention is concentrated on the synthesis of heterocycles with functional group substituents at the silicon atom as well as high-temperature reactions with participation of unstable intermediates: silylenes, sila-alkenes, and siladienes. The bibliography includes 130 references.