FIELD: chemistry.
SUBSTANCE: invention relates to methods of producing oligodiorganosiloxanes, used as working fluid in oil-vapour vacuum pumps for creating moderate and ultrahigh vacuum; as working medium for droplet cooler-radiators of frameless systems for removal of low-grade heat of space nuclear power systems. Disclosed is a method of producing α, ω-bis(methyl diphenylsilyl)oligodiorganosiloxanes of formula 
(I), where k=1,2; for k=1 R=Me (1a), R=Ph (1b); for k=2 R-Ph (1c), by condensation of diorganodichlorosilane and sodium methyl diphenyl silanolate, involving a step for drying the sodium methyl diphenyl silanolate, which is carried out using dimethyl dichlorosilane which is taken in amount of 0.1-1 mol % of the amount of sodium silanolate.
EFFECT: disclosed method is ecologically clean and reduces power consumption, time and labour costs.
1 cl, 4 ex
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