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A dibenzenesodium sandwich and an ether “plug” are the salient features of the structure of 1. The structural changes occurring on reduction of tetraphenylallene to 1 are similar to those previously found from MNDO calculations for the reduction of allene. MNDO calculations also offer an explanation for the observed coordination of the sodium ion: the sum of the charges on the two complexing benzene rings is greater than that of an allyl anion center.
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Bock et al. (1990) studied this question.
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