A 1:1 mixture of the (π-allyl)palladium complex (η 3 -C 3 H 5 )Pd(Cl)PCy 3 and NaB[3,5-C 6 H 3 (CF 3 ) 2 ] 4 in the presence of HSiEt 3 catalyzed the cycloisomerization of functionalized 1,6-dienes to form 1,2-disubstituted cyclopentenes in good yield with high selectivity (typically >94%). The protocol tolerated a range of functional groups and substitution at one of the allylic carbon atoms.
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Widenhoefer et al. (1999) studied this question.
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