Interconversion of stereoisomeric cycloorganosiloxanes

Details Interconversion of stereoisomeric cycloorganosiloxanes Interconversion of stereoisomeric cycloorganosiloxanes

1975-06-02

1976-05-04

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2604488R, C07F 702, C07F 708, C07F 720

Patent

active

039548236

ABSTRACT:
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-diphenylhexamethylcyclotetrasiloxane to the 2,6-cis-isomer by heating in 2-nitropropane solvent in the presence of anhydrous zinc chloride.

REFERENCES:
patent: 3332974 (1967-07-01), Bostick
patent: 3493595 (1970-02-01), Strasser et al.

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