Process for preparing 2,4,4,6-tetrabromo-2,5-cycloyhexadienone

Details Process for preparing 2,4,4,6-tetrabromo-2,5-cycloyhexadienone Process for preparing 2,4,4,6-tetrabromo-2,5-cycloyhexadienone

2005-01-04

2005-01-04

Richter, Johann (Department: 1621)

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

Organic compounds

Oxygen containing

C568S364000

Reexamination Certificate

active

06838582

ABSTRACT:
A highly pure 2,4,4,6-tetrabromo-2,5-cyclohexadienone has been prepared in a single pot, eco-friendly procedure in yields of 91-94% from phenol. In this method, a mixture of alkali/alkaline earth metal bromide and alkali/alkaline earth metal bromate was employed as brominating agent in place of corrosive liquid bromine. The reaction between phenol and the brominating reagent was initiated by the action of a mineral acid or moderately strong organic acid. The crude product was further characterized by standard analytical and spectroscopic methods.

REFERENCES:
patent: 4250341 (1981-02-01), Needham et al.
patent: 4954662 (1990-09-01), Desmurs et al.
patent: 6365786 (2002-04-01), Ramachandraiah et al.
L Chas Raiford et al., “Some bromination products of the fluorophenols” Journal of the American Chemical Society, vol. 66, 1944, pp. 2080-2082, XP 002252362, American Chemical Society, Washington, DC, pp. 2080-2082.

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