Preparation of cyclic diphenylsiloxanes

Details Preparation of cyclic diphenylsiloxanes Preparation of cyclic diphenylsiloxanes

1976-07-30

1978-03-14

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 708

Patent

active

040790703

ABSTRACT:
In the preparation of a cyclic diphenylsiloxane of the formula ##STR1## WHEREIN N IS 3 OR 4, BY HYDROLYSIS OF A DIPHENYLDIHALOGENOSILANE, THE IMPROVEMENT WHICH COMPRISES ADDING THE DIPHENYLDIHALOGENOSILANE, IN THE PRESENCE OF AN ORGANIC, APROTIC SOLVENT TO AN AQUEOUS BASIC SOLUTION, THE BASE BEING EMPLOYED IN AN AMOUNT WHICH IS AT LEAST STOICHIOMETRICALLY EQUIVALENT TO THE HALOGEN CONTENT, WHEREBY THE CYCLIC DIPHENYLSILOXANE IS OBTAINED IN HIGH YIELD AND PURITY. The base is preferably lithium hydroxide, potassium hydroxide or sodium hydroxide and is used in the form of an at least 5 molar solution, about 2.1 to 2.5 equivalents being used per mole of diphenyldihalogenosilane.

REFERENCES:
patent: 3484469 (1969-12-01), Guinet et al.
patent: 3607898 (1971-09-01), Macher
patent: 3983148 (1976-09-01), Reedy et al.
Noll, "Chemistry and Technology of Silicones", Academic Press, N.Y. (1968), pp. 192-196.

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