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A cationic phosphinegold(I)-catalyzed intramolecular 2 + 2-cycloaddition between an allene and an alkene to form alkylidene−cyclobutanes is described. Additionally, the reported cycloisomerization reaction provides access to enantioenriched bicyclo-3.2.0 structures using chiral biarylphosphinegold(I) complexes as catalysts.
Luzung et al. (Fri,) studied this question.