Dehydrochlorination method

Details Dehydrochlorination method Dehydrochlorination method

1977-02-14

1978-02-14

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260520R, 260590D, 260619B, 560 57, C07C 3700

Patent

active

040738140

ABSTRACT:
A method is provided for dehydrochlorinating 1,1,1-trichloro-2,2-bis(4-hydroxyphenyl)ethane to produce substantially pure 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene, based on the employment of a dipolar aprotic solvent and a basic alkali metal compound, such as sodium hydroxide, sodium carbonate, etc. Crystallization of the 1,1-bis(p-hydroxyphenyl)-2,2-dichloroethylene from the dehydrochlorination reaction mixture can provide monomer useful for making high impact, flame retardant thermoplastic polycarbonates.

REFERENCES:
patent: 3856556 (1974-12-01), Bzozowski et al.

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