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A simple and efficient synthesis of the phospholyl anion 3 was achieved by reaction of zirconacyclopentadiene 1 with PCl3 and Li/TMEDA (TMEDA = tetramethylethylenediamine). The structural parameters obtained by X-ray analysis confirm that 3 is aromatic. This procedure for the preparation of 3 appears to be applicable to other precursors.
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Douglas et al. (1989) studied this question.
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