Abstract: 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.

Abstract: Adducts of trichloromethane phosphonic dichloride and olefinically unsaturated compounds having the general ##STR1## WHEREIN Q designates: A. (C R"R'" -- C R R').sub.nwherein R and R', which may be the same or different, each designatesH, alkyl or flourine;R" designates H, alkyl, aryl, substituted aryl, fluorine, chlorine, bromine, cyano, carbalkoxy, carboxy, acyloxy-methylene, acyloxy propylene, acetoxy, alkoxy, sulfonyl-alkyl or sulfonyl-aryl and R'" designates H, alkyl, fluorine, chlorine or bromine, or R and R" form together a ring system, and n is an integer of from 1 to about 500;B. (CH.sub.2 CR.sup.IV .dbd. CR.sup.V CH.sub.2).sub.mwherein R.sup.IV and R.sup.V, which may be the same or different, each designates hydrogen, methyl or chlorine, and m is an integer of from 1 to about 200.

Abstract: 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.nwherein R and R', which may be the same or different, each designatesH, alkyl or flourine;R" designates H, alkyl, aryl, substituted aryl, fluorine, chlorine, bromine, cyano, carbalkoxy, carboxy, acyloxy-methylene, acyloxy propylene, acetoxy, alkoxy, sulfonyl-alkyl or sulfonyl-aryl and R'" designates H, alkyl, fluorine, chlorine or bromine, or R and R" form together a ring system, and n is an integer of from 1 to about 500;B. (CH.sub.2 CR.sup.IV .dbd. CR.sup.V CH.sub.2).sub.mwherein R.sup.IV and R.sup.V, which may be the same or different, each designates hydrogen, methyl or chlorine, and m is an integer of from 1 to about 200.