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Pd(0) catalysed termolecular queuing processes involving cyclisation of aryl halides onto proximate alkynes, allene (1 bar) insertion, transmetallation of the resulting π-allylpalladium(II) species with indium and addition to an aldehyde affords heterocyclic and carbocyclic dienes.
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Grigg et al. (2000) studied this question.
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