Crystal structure of 7-bromo-5,8-dihydroxy-4,4-dimethyl-4H-naphthalen-1-one

An X-ray diffraction study of the 7-bromo-5,8-dihydroxy-4,4-dimethyl-4H-nap hthalen--1-one (1), obtained by bromination of 5,8-dihydroxy-4.4-dimethyl-4 H-naphthalen-1-one with molecular bromine, gave unambiguous proof of its re giochemistry. Crystal is monoclinic, space group P2(1)/c, and the unit cell parameters are a = 8.300(1), b = 14.101(1), c = 19.239(2) Angstrom, beta = 93.91(1)degrees, Z = 8. The final R factor at room temperature was 0.036 f or 1717 observed reflections. The molecular structure is essentially planar , with the exception of the geminal methyl groups, and no unusual bond leng ths or angles were found.