2.3,4.5,6-Pentabromobiphenyl has been prepared by the decompositon of pentabromoaniline by pentyl nitrite in benzene at 800• and by the U1hnann reaction between iodobenzene, pentabromoiodobenzene and copper powder. The yield of the biaryl formed from the thomolytic aryIation of benzene decreases as O-bromoaniline. 2.4,5-tribromoaniline. or pentabromoaniline is the source of the attacking radical. This decrease is paralleled by an increase in the yield of the benzene derivative arising from the formal protiodeamination of the parent aniline derivative.
G H WILLIAMS ,R BOLTON ,M I BANGER ,
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