132018-85-0Relevant academic research and scientific papers
Synthesis and Structural Aspects of Phosphane - Boranes Derived from Tris(diphenylphosphino)methane, HC(PPh2)3
Schmidbaur, Hubert,Stuetzer, Albert,Herdtweck, Eberhardt
, p. 1095 - 1100 (2007/10/02)
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 deg C in CH2Cl2) show free intramolecular motion in solution.The partially or fully borylated adducts HC(PPh2)2 (2), HC(PPh2)2 (3), and HC3 (4) have been prepared from 1 and THF x BH3 or Me2S x 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.Key Words: Triphosphanes / Phosphane-boranes
