METHOD OF PRODUCING UNSYMMETRICAL CYCLOTETRASILOXANES Russian patent published in 2022 - IPC C07F7/21 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering of organosilicon compounds. Disclosed is a method of producing unsymmetrical organocyclotetrasiloxanes of general formula [(CH₃)₂SiO]₃[R₁R₂SiO], where R₁ = R₂ and denote C₂H₅ or C₆H₅, or if R₁ denotes CH₃, R₂ denotes CH₂ = CH, H or C₆H₅, including (a) the reaction of dimethylsiloxanes of linear or cyclic structure with sodium hydroxide to form sodium hexamethyltrisiloxane diolate and (b) its subsequent reaction with diorganodichlorosilane of the corresponding structure in an organic solvent. Organic solvent used is a solvent selected from diethyl ether, methyl-tert-butyl ether, tetrahydrofuran, dioxane, dimethoxyethane, pyridine. Content of sodium hexamethyltrisiloxane diolate in the organic solvent ranges from 5 to 15 wt. %.

EFFECT: disclosed method of producing asymmetric organocyclotetrasiloxanes provides selective formation of the end product with high output and the absence of hydrochloric acid wastes, is economical and environmentally friendly.

3 cl, 1 tbl, 6 ex