70 years ago the existence of the 2-carbene isomer of pyridine, which arises by pyridine–carbene tautomerization (see scheme), was postulated. Now it has been prepared from pyridine as a stable carbene complex by metal-induced CH activation. This pyridine–carbene tautomerization is described and discussed along with other analogous carbene tautomerization reactions.
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Doris Kunz (2007) studied this question.
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