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Sodium pentaphosphacyclopentadienide has been prepared as a pure NaP5/[18]crown-6/THFsolution by reacting white phosphorus with sodiumdihydrogenphosphide (P :NaPH2 = 5:1 to 5.6:1) in boiling tetrahydrofuran in the presence of [18]crown-6.
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Bäudler et al. (1989) studied this question.
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