Abstract: The present invention relates to a ?-[2-(polyalkyleneoxy)ethylthio]alkylalkoxysilane derivative and a preparation method thereof, more particularly to a ?-[2-(polyalkyleneoxy)ethylthio]alkylalkoxysilane derivative prepared by transforming a (?-mercaptoalkyl)alkylalkoxysilane compound into a ?-(alkoxysilyl)alkylthiolate metal salt by treating it with a metallic base and performing dehalometallation at low reaction temperature using a poly(alkyleneoxy)alkyl ether halide or a poly(alkyleneoxy)bis(haloalkyl) ether to form a carbon-sulfur bond and a preparation method thereof. The novel compound of the present invention has not only a Si—OR bond but also contains a sulfur atom in the molecule, so that it can be used as monomer for synthesizing hydrophilic functional silicon polymers, source material of silicon-based surfactants and surface modifier of organic/inorganic materials.

Abstract: This invention relates to (organothiomethyl)chlorosilanes and methods for their preparation by the dehydrohalogenative Si—C coupling reaction of oranothiomethyl halides with Si—H containing chlorosilanes (hydrosilanes), wherein a mixture of oranothiomethyl halide and hydrosilane is heated in the presence of tertiary amine or organic salts (quaternary organoammonium and organophosphonium halides to give (organothiomethyl)chlorosilanes, which is existing a sulfur atom in alkyl chain, (formula:: R2SCH2SiCl2R1) in good yield, wherein R1 represents a hydrogen atom, halogen, or C1-C6 alkyl; R2 is selected from the group consisting of C1-C6 alkyl or an aryl group. Especially, this reaction using organic salt as a catalyst provide better economical matter and yield compared with conventional methods, because only catalytic amount of organic salt is required and the catalyst can be separated from the reaction mixture and recycled easily.