Rings of gold: Vinylidenecyclopropanes can undergo efficient oxidative ring enlargements under mild conditions to give the corresponding alkylidenecyclobutanone derivatives in good yields. A plausible mechanism for this transformation has been proposed, and a new Au(I) -N complex, which can be used as an efficient catalyst in this oxidation reaction, has been isolated.
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Yuan et al. (2012) studied this question.
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