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A visible-light photocatalytic cyclopropanation of diverse alkenes using acceptor-acceptor diazoalkanes has been developed. The protocol provides an efficient and practical approach to donor-acceptor cyclopropanes under mild conditions. Experimental evidence confirms a mechanism involving a highly electrophilic triplet acceptor-acceptor carbene intermediate, followed by ultrafast intersystem crossing and ring closure.
Gao et al. (Thu,) studied this question.
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