Answer to Question #9969 in Organic Chemistry for Brayden
Bromobenzene mp -30 bp 156
Benzene mp 5.5 bp 80
How much biphenyl do you have? If biphenyl is major product, bromobenzene and benzene are impurities, the follow method is appropriate. Just evaporates the diethyl ether and filtered off the biphenyl (wash the precipitate with small amount appropriate solvent and to dry in vacuum). If amounts of biphenyl, bromobenzene and benzene are equal, evaporate benzene and bromobenzene in vacuo (ca.10-50 torr) with moderate warming (ca.100 C). Then distill the biphenyl in high vacuum(ca. 10^-2 torr - 10^-3 torr).
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