Abstract
THE following polyphosphines of formula (C6H5P)n have been reported in the literature: (A) m.p. 149°–150° (refs. 1–9); (B) m.p. 190° (refs. 2 and 3); (C) m.p. 252°–256° (ref. 3); (D) m.p. 260°–285° (ref. 8). Compounds C and D are insoluble in organic solvents and have, presumably, a polymeric structure. The molecular weights of A and B in solution have not been established definitely. Several isopiestic, ebullioscopic and cryoscopic methods have been used by various workers and the following identities have been proposed. A = B = I2; A = I, B = II3; A = B = II8; A = II4,5,9. Recently it has also 
been shown8 that compounds A and B are tetraphenyl-cyclo-tetraphosphines (II) which differ in both the dissolved and solid states and are stereoconformers.
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DALY, J., MAIER, L. Molecular Structure of Phosphobenzene. Nature 203, 1167–1168 (1964). https://doi.org/10.1038/2031167b0
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DOI: https://doi.org/10.1038/2031167b0
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