Brominated biphenols
AssigneeGeneral Electric Company
InventorsCharles M. Orlando, Francois A. Lavallee
Life of this patent
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Abstract
Bromobiphenols containing at least two bromine atoms meta to the phenolic hydroxyl groups can be produced from 3,3',5,5'-tetra-substituted diphenoquinones by reacting the latter with bromine. The reaction can be controlled to produce little, if any, by-product. The products obtained are dependent to some extent on the substituents in the four positions ortho to the hydroxyl groups. The biphenols can be used as antioxidants or as starting materials for preparation of flame-retardent polymeric compositions useful in the molding, coating and insulating arts.
Claims6
A bromination process which comprises contacting liquid bromine with a diphenoquinone of the formula ##SPC3##
- where independently each R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a normal methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl or octyl radical or is a cyclohexyl radical, and recovering a biphenol of the formula ##SPC4##
- where each R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is as previously defined.
Dependencies are inferred from the claim text.