relative stability order of the conformers changes with the complexation only in the case of cyclopropylamine. The calculated complexation energies are higher for the amines, in accord with the differences observed in the flash vacuum thermolysis of methylamine-, methylphosphine-, and aziridine-borane. The photoelectron spectra indicate essential differences between the amines and phosphines toward borane
The Ever-Surprising Chemistry of Boron: Enhanced Acidity of Phosphine⋅Boranes
作者:Marcela Hurtado、Manuel Yánez、Rebeca Herrero、Andrés Guerrero、Juan Z. Dávalos、José-Luis M. Abboud、Brahim Khater、Jean-Claude Guillemin
DOI:10.1002/chem.200802307
日期:2009.4.27
The acidity‐enhancing effect of BH3 in gas‐phase phosphine⋅boranes compared to the corresponding free phosphines is enormous, between 13 and 18 orders of magnitude in terms of ionization constants. Thus, the enhancement of the acidity of protic acids by Lewis acids usually observed in solution is also observed in the gas phase. For example, the gas‐phase acidities (GA) of MePH2 and MePH2⋅BH3 differ