Interconversion of stereoisomeric cycloorganosiloxanes

Details Interconversion of stereoisomeric cycloorganosiloxanes Interconversion of stereoisomeric cycloorganosiloxanes

C - Chemistry, Metallurgy

07

F

260/449

C07F 7/21 (2006.01) C07F 7/08 (2006.01)

Patent

CA 1053253

ABSTRACT OF THE INVENTION Stereoisomers of cycloorganosiloxanes are interconverted without siloxane bond redistribution by reacting the cyclic siloxane with anhydrous zinc chloride, zinc bromide, ferric chloride, aluminum chloride or aryl phosphonium chlorides in the presence of nitro compounds or aryl phosphate esters as solvents. A typical example is the conversion of 2,6-trans-diphenylhexamethyl- cyclotetrasiloxane to the 2,6-cis-isomer by heating in 2-nitropropane solvent in the presence of anhydrous zinc chloride, The cycloorganopolysiloxanes produced herein are useful in the production of linear polysiloxanes and may be biologically active compounds.

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