Vr. Rao et al., METAL-MEDIATED ORGANIC-SYNTHESIS - ICHLORO(N,N'-ETHYLENE-BIS-AMINOBENZAMIDE)LANTHANUM AND SAMARIUM AS A NEW CATALYST FOR HALOGENATION OF 1,4-QUINONES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 35(6), 1996, pp. 581-582
1, 4-Benzoquinone and 1, 4-naphthaquinone derivatives have been haloge
nated selectively and smoothly at vinylic position with bromine in pre
sence of trichloro(N, N-ethylene-bis-aminobenzamide)lanthamum (III) an
d samarium(III) catalysts.