The ClCl bond in the carbenoid 1 is about 12 pm longer than that in the compound containing a H atom in place of the Li substituent. This explains the facile reaction of carbenoids with the nucleophiles RLi. The X-ray crystal structure of 1 is consistent with 13C-NMR data, as well as with the stereochemistry of reactions of carbenoids with RLi or the Fritsch–Buttenberg–Wiechell rearrangement of vinyl carbenoids.
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Boche et al. (1993) studied this question.
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