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正膦

正膦的結構

正膦IUPAC名稱:λ5-phosphane)是有機化學中的官能基,其中含有5價的,其通式為PR5。其對應的氫化物是不穩定的PH5分子。其衍生物五苯基-正膦(pentaphenylphosphorane,Ph5P)是穩定的[1]

正膦是双三角锥形分子构型,頂上的二個鍵較其他的鍵要長。因為有未鍵結的分子軌域,因此是超价分子,就像分子五氟化磷一樣[2]

有R3P=CR2型式的正膦更常見也更重要,正膦也是葉立德的一種共振結構之一。這種化合物組成一個中心是磷的的四面體,包括一個磷和碳的雙鍵。這種化合物可用作维蒂希反应試劑,例如亚甲基三苯基膦,Ph3P=CH2

相關條目

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參考資料

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  1. ^ ^ A Guide to Organophosphorus Chemistry Louis D. Quin 2000 John Wiley & Sons ISBN 0-471-31824-8
  2. ^ G. L. Miessler and D. A. Tarr “Inorganic Chemistry” 3rd Ed, Pearson/Prentice Hall publisher, ISBN 0-13-035471-6.
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正膦
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