Process for producing brominated acenaphthylene condensates

Details Process for producing brominated acenaphthylene condensates Process for producing brominated acenaphthylene condensates

1984-05-31

1990-02-06

Lone, Werren B.

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

Organic compounds

Halogen containing

20415799, 526 75, 526280, 526296, 528397, 528495, 528496, 528498, 570193, 570197, 570199, 570200, 570206, 570211, C07C 1700

Patent

active

048989983

ABSTRACT:
A process for producing brominated acenaphthylene condensates of the formula: ##STR1## wherein x is 1 or 2, y is an integer from 1 to 6 and n is 1 or more, from elementary units of the following formulas: ##STR2## wherein y is as defined above, comprising, (A) brominating the side chain of the acenaphthene with 0.2 to 2.0 times as many moles of bromine as acenaphthene, said bromination initiated by ultraviolet radiation or by a radical initiator in a halogenated hydrocarbon solvent, (B) adding a Lewis acid catalyst to the reaction solution of step (A) to promote the condensation of the brominated acenaphthene product of step (A), (C) adding to the reaction solution of step (B) an equimolar or more amount of bromine relative to the amount of acenaphthene starting material, to further brominate and condense the brominated acenaphthene and/or brominated acenaphthene condensates; and (D) dehydrobrominating the brominated acenaphthene condensates.

REFERENCES:
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patent: 3833674 (1974-09-01), Brackenridge
patent: 3845146 (1974-10-01), Moore et al.
patent: 4089843 (1978-05-01), Rausch
patent: 4373046 (1983-02-01), Hagwara et al.
patent: 4394484 (1983-07-01), Jenkner et al.
patent: 4423262 (1983-12-01), Jackisch
Y. Morita et al, J. Applied Polymer Science, vol. 27, 3329-3339 (1982).

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