SCHEDULED MAINTENANCE
The bisdibromocarbene adduct (9a) on treatment with methyl-lithium at temperatures below ca.–50 °C undergoes a ring-closure reaction by 1,6-elimination to give after reduction anti-σ-bishomobenzene (11); above –50 °C products derived from 1,1-eliminations and subsequent cyclopropyliden(oid)–allene rearrangements dominate.
U. H. Brinker, H. Wüster and G. Maas, J. Chem. Soc., Chem. Commun., 1985, 1812 DOI: 10.1039/C39850001812
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