As temporary climax in carbenoid research, G. Boche et al. (see p.1032 ff) succeeded in performing an X-ray crystal analysis on 1-chloro-2,2-bis(chlorophenyl)-1-lithioethene (1). The structure confirms that the carbenoid C atom has rehybridized, as predicted by Köbrich. This result will certainly give impetus to investigations into the relationship between structure and reactivity in carbenoids.
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Adalbert Maercker (1993) studied this question.
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