Synthesis and Structural Aspects of Phosphane – Boranes Derived from Tris(diphenylphosphino)methane, HC(PPh2)3

Hubert Schmidbaur, Albert St ützer, Eberhardt Herdtweck

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22 Scopus citations

Abstract

The structure of tris(diphenylphosphino)methane, HC(PPh2)3 (1), has been determined by X‐ray diffraction. The molecules have approximate C3 symmetry with the lone pairs at the three phosphorus atoms in an “all‐trans” orientation. Variable‐temperature NMR experiments (+ 35 to − 90°C in CH2Cl2) show free intramolecular motion in solution. The partially or fully borylated adducts HC(PPh2)2[PPh2(BH3)] (2), HC(PPh2)[PPh2;‐(BH3)]2 (3), and HC[PPh2(BH3)]3 (4) have been prepared from 1 and THF · BH3 or Me2S · BH3. For 2 and 3 the internal rotation about the phosphorus‐methine carbon bonds is also essentially unhindered, but has been shown to be restricted in 4 (Ea=31.2 kJ/mol). The chemical shifts of the methine protons in these compounds can be calculated on the basis of a BH3 substituent constant.

Original languageEnglish
Pages (from-to)1095-1100
Number of pages6
JournalChemische Berichte
Volume124
Issue number5
DOIs
StatePublished - 1991
Externally publishedYes

Keywords

  • Phosphane – boranes
  • Trisphosphanes

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