Bromine Compounds Limited

David Beneish

Michael R Peled

David Itzhak

Nurit Kornberg

Ariel A Ewenson

Bertha Croitoru

Asher Shushan

Miriam Freiberg Bergstein

Naim Faza

Processes for the electrophilic substitution of aromatic compounds, such as alkylation, with a desired substituent are disclosed. The processes include contacting the aromatic compound, a precursor of the desired substituent and an aqueous reagent containing zinc halide at elevated temperatures such as above 50&deg; C.

Process for electrophilic aromatic substitution

Tribromostyrene (TBS) is produced by the preparation of a TBS precursor, which is .beta.-bromoethyl-tribromobenzene (.beta.-BrBr.sub.3), and the successive elimination of hydrogen bromide from said precursor. The precursor is prepared by selective bromination of phenethyl bromide (.beta.-Br), wherein the molar ratio of bromine to phenethyl bromide is comprised between 2.5 and 3.5, and preferably between 3.1 and 3.3 included; and by adding bromine, after an initial addition, at a controlled molar rate.

Tribromostyrene products and process for making them

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Omer, Israel

David Beneish