METHOD OF PRODUCING STEREOREGULAR CYCLOLINEAR OLIGOSILOXANES OF α,ω-DIHYDROXYPOLY(OXY-2,8-DIORGANO-4,4,6,6,10,10,12,12-OCTAMETHYLCYCLOHEXASILOXANE-2,8-DIIYLS) Russian patent published in 2012 - IPC C08G77/04 

FIELD: chemistry.

SUBSTANCE: invention relates to the chemistry of high-molecular weight compounds. Disclosed is a method of producing stereoregular cyclolinear oligosiloxanes of α,ω-dihydroxypoly[oxy-(2,8-diorgano-4,4,6,6,10,10,12,12-cyclohexasiloxane-2,8-diiyls)] with a cyclohexasiloxane chain link, bonded to each other by a ≡Si-O-Si≡ with general formula:

,

where: 1) R=CH₃, -CH=CH₂, C₆H₅, 2) n=2-10, through homocondensation of trans-isomers of 2,8-dihydroxy-2,8-diorgano-4,4,6,6,10,10,12,12-octamethylcyclohexasiloxanes in a solution of aromatic hydrocarbons selected from toluene and xylene while heating to boiling point of the solvent in the presence of compounds with a layer structure: montmorillonite or coal, taken in ratio of 5-30% for 30-90 hours.

EFFECT: disclosed method ensures high stereoregularity of the formed cyclolinear polymers at the next steps when using the obtained oligomers as precursors.

1 cl, 5 ex