Xj. Gai et al., Palladium catalyzed intramolecular nucleophilic addition of allylic species, generated from allene, to aryl aldehydes and ketones, CHEM COMMUN, (18), 2000, pp. 1765-1766
2-Haloaryl aldehydes and ketones react with allene (1 atm) in the presence
of 2 mol% of a non-phosphine cyclopalladated catalyst to afford cyclopenten
ols and cyclohexenols via nucleophilic cyclisation of intermediate pi-allyl
palladium species. A possible mechanism for this unusual reactivity is sugg
ested.