Tying up loose ends: The reaction of bisallenes tethered with N-(p-tolylsulfonamide) in the presence of a cationic gold N-heterocyclic carbene catalyst gave new cycloisomerization products, 6,7-dimethyleneazabicyclo[3.1.1]heptanes, in high yields (see scheme; IPr = N,N'-bis(2,6-diisopropylphenyl)imidazol-2-ylidene).
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Kim et al. (2009) studied this question.
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