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- W2079073312 abstract "The synthesis of a series of cyclic pentaoxyphosphoranes containing a sulfonyl group was carried out by the reaction of either P(OCH2CF3)3 or P(OPh)3 with the appropriate diol in an oxidative addition reaction: O2S[(t-Bu)MeC6H2O]2P(OCH2CF3)3 (1), O2S[(t-Bu)MeC6H2O]2P(OPh)3 (2), O2S[(t-Bu)2C6H2O]2P(OCH2CF3)3 (4), and O2S[(t-Bu)2C6H2O]2P(OPh)3 (5). Reaction of 2 with catechol yielded O2S[(t-Bu)MeC6H2O]2P(OPh)(C6H4O2) (3). X-ray studies provided the structures of 1−5, although 4 was badly disordered. The geometries of 2, 3, and 5 are octahedral due to P−O coordination provided by the sulfonyl group, whereas 1 and 4 are trigonal bipyramidal. Solution 31P, 1H, and 19F NMR spectra demonstrate that 1 and 4 exist in isomeric modifications. These are formulated as a pentacoordinate structure, as in the solid state, and a hexacoordinate structure. This represents the first study establishing intramolecular intraconversion between penta- and hexacoordinate isomers of phosphorus. An activation free energy of 17 kcal/mol for the exchange process for 1 and 4 was obtained from variable temperature 1H NMR spectra." @default.
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- W2079073312 date "1997-11-01" @default.
- W2079073312 modified "2023-09-26" @default.
- W2079073312 title "Isomeric Intraconversion among Penta- and Hexacoordinate Cyclic Oxyphosphoranes via Oxygen Atom Coordination<sup>1</sup><sup>,</sup><sup>2</sup>" @default.
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- W2079073312 doi "https://doi.org/10.1021/ja9722988" @default.
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