Selective dehydrobromination

Details Selective dehydrobromination Selective dehydrobromination

1989-07-19

1990-10-02

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570204, 570220, C07C 1724, C07C 1734

Patent

active

049609629

ABSTRACT:
ar-Bromoaromatics having an alkenyl side chain on the aromatic nucleus are formed by feeding a beta-bromoalkyl-ar-bromoaromatic compound, together with a substantial excess of water, into a thermal dehydrobromination zone held at or above 475.degree. C., and maintaining a very short residence time (5 seconds or less) in the dehydrobromination zone. Very little extraneous co-products are formed. For example dibromostyrene was produced by co-feeding bromoethyldibromobenzene (BEDB) and excess amounts of water (using nitrogen as a carrier gas) into a Vycor tube packed with glass beads at 500.degree. C. By suitable controlling residence times, the amount of undesired coproducts formed was kept below 1.5 G. C. area %, and the percentage of BEDB conversion was in the range of 84.1% up to 99.1%.

REFERENCES:
patent: 3560580 (1971-02-01), Burk
patent: 3737469 (1973-06-01), Berger et al.
patent: 3867468 (1975-02-01), Vofsi et al.
patent: 3966831 (1976-06-01), Levy et al.
patent: 3980722 (1976-09-01), Cohen et al.
patent: 4292453 (1981-09-01), Daren et al.
patent: 4423262 (1983-12-01), Jackisch
patent: 4633026 (1986-12-01), Kolich
Daren et al., British Polymer Journal, 1975, vol. 7, pp. 247-261.

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