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The Ever‐Surprising Chemistry of Boron: Enhanced Acidity of Phosphine⋅Boranes |
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| Authors: | Marcela Hurtado Dr Manuel Yánez Prof Dr Rebeca Herrero Andrés Guerrero Juan Z Dávalos Dr José‐Luis M Abboud Prof Dr Brahim Khater Dr Jean‐Claude Guillemin Dr |
| Institution: | 1. Departamento de Química, C‐9, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid (Spain), Fax: (+34)?91‐497‐5238;2. Instituto de Química Física Rocasolano, CSIC, C/Serrano, 119. 28006 Madrid (Spain);3. Sciences Chimiques de Rennes, UMR 6226 CNRS‐ENSCR, Avenue du Général Leclerc, 35708 Rennes Cedex 07 (France), Fax : (+33)?223‐23‐81‐08 |
| Abstract: | 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 by about 118 kJ mol?1 (see picture).  |
| Keywords: | ab initio calculations acidity gas‐phase reactions ion cyclotron resonance phosphanes |