High Quality Content by WIKIPEDIA articles! A phosphorane (IUPAC nomenclature: ?5-phosphane) is a functional group in organophosphorus chemistry with pentavalent phosphorus. It has the general formula PR5. The parent compound is the unstable molecule PH5. The derivative pentaphenylphosphorane (Ph5P) is stable.Phosphoranes adopt a trigonal bipyramidal molecular geometry with the two apical bonds longer than the three equatorial bonds. Bonding is described by three-center, 4-electron bonds, as also invoke for closely related molecule phosphorus pentafluoride.

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