Cyclisation of 2-diazoacetylbiphenyl with rhodium(II) acetate or mandelate yields the unstable benz[a]azulen-10(9aH)-one from which benz[a]azulene can be obtained by lithium aluminium hydride reduction; similar reactions with the related diazoketones (2)–(5) yield stable benzobicyclotrienones in high yield.
H. Duddeck, M. Kennedy, M. A. McKervey and F. M. Twohig, J. Chem. Soc., Chem. Commun., 1988, 1586 DOI: 10.1039/C39880001586
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