Reaction of biphenylene with butyl-lithium gives a mixture of 1- and 2-lithiobiphenylene in the approximate ratio of 20 : 1. This mixture has been used to prepare the following 1-substituted biphenylenes: pentanoyl, methoxycarbonyl, carboxy, acetyl, formyl, hydroxymethyl, bromo-methyl, methyl, hydroxy, methoxy, acetoxy, allyloxy, carboxymethoxy, and iodo.
A. J. Boulton, J. B. Chadwick, C. R. Harrison and J. F. W. McOmie, J. Chem. Soc. C, 1968, 328 DOI: 10.1039/J39680000328
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