... 2,3,4,5-Tetrabromo-6-(4-hydroxy-3,5-dime~hylbenzoyl)benzoic acid(13): 2,6-XyIenol(3.054 g, 25 mmol) was added to a mixture of tetrabromophthalic anhydride (11.59 g, 25 mmol), anh. ... 116(1983) ... Successive cry- stallizations from a small volume of acetic acid and then from aq ...