Two different Li environments characterize the solvent-free, polymeric structure of 1 in the crystal. A tetrameric chain is formed by Li atoms, which are coordinated by two O and three or five C atoms. In contrast, 1 exists as isolated tetramers in THF. The C(Li)O carbenoid character of 1 results in an elongated CO bond and in lithium bridging.
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Sorger et al. (1995) studied this question.
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