Abstract: In supporting our recent discovery of the gas-phase reaction of monomeric difluorosilylene, reactions of SiFz with trans-and cis-difluoroethylene, vinyl chloride, and vinyl fluoride are studied in the gas phase. Compounds from insertion of monomeric SiF2 into carbon-halogen bonds are the only type of product obtained in these reactions. In order to avoid the complication that might be brought into the case of cocondensation ...