We describe here a direct, efficient, one-step construction of gamma,gamma-difunctionalized gamma-butyrolactones from benzoins or benzaldehydes via a tandem reaction promoted by 1,3-dimethyl imidazolin-2-ylidene, an N-heterocyclic carbene (NHC). [reaction: see text]
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Wei et al. (2005) studied this question.
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