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Prof. Dr. Hubert Schmidbaur, Dipl.-Chem. Thomas Costa, Dipl.-Chem. Beatrix Milewski-Mahrla and Dr. Ulrich Schubert Ring-Strained Carbodiphosphoranes Angewandte Chemie International Edition in English 19

Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.198005551

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The first rings to contain the structural unit P[DOUBLE BOND]C[DOUBLE BOND]P have been obtained by reaction of Ph2PCH2PPH2 with Br(CH2)nBr (n = 2, 3, 4). The chemical properties and the bond lengths and angles in carbodiphosphorane with n = 2 are best described by the following formulation:

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