Rhone-Progil

Makhteshim Chemical Works Ltd.

Meir Asscher

Hadassa Rosin

David Vofsi

Stephen L Daren

The present invention relates to the production of ring-halogenated styrene monomers of high purity. These are of value in the production of polymers which possess flame retardance. The process of the invention comprises reacting heterogenously ring halogenated beta-bromoethyl benzene with a strong aqueous alkali base in the presence of a quaternary phase transfer catalyst until substantially all the bromoethyl benzene has undergone reaction, separating the phases, washing and neutralizing the organic phase and recovering the ring-halogenated styrene monomer, which is the desired product.

Process for preparing ring halogenated styrenes

Adducts of trichloromethane phosphonic dichloride and olefinically unsaturated compounds having the general ##STR1## WHEREIN Q designates: A. (C R'R'' -- C R R').sub.n

Adducts of olefins and trichloromethane phosphonic dichloride

Adducts of trichloromethane phosphonic dichloride and olefinically unsaturated compounds having the general formula ##STR1## WHEREIN Q designates: A. (C R'R''--C R R').sub.n

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Rehovot, Israel

Meir Asscher