Details

Autor(en) / Beteiligte

• Andrada, Diego M
• Michoff, Martin E. Zoloff
• Rossi, Rita H. de
• Granados, Alejandro M

Titel

Role of the hydrophobicity on the thermodynamic and kinetic acidity of Fischer thiocarbene complexesDedicated to Prof. Pelayo Camps García, Facultad de Farmacia, Universidad de Barcelona, on the occasion of his 65th birthdayElectronic supplementary information (ESI) available: Fig. S1, UV-vis spectra showing the recovery of the Fischer carbene W-Sc-Hex upon acidification of its anion; Fig. S2 and S3, showing the correlation of ΔGcavvs. pKCHa and log P; Tables S1-S40, kinetic data for the reactio

Erscheinungsjahr

2010-06

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Rate constants for the reversible deprotonation of (CO) 5 W=C(SR)CH 3 ( W-SR ) by OH − , water and a number of primary aliphatic and secondary alicyclic amines, have been determined in 50% MeCN:50% water at 25 °C. In addition, solvation energy and proton affinities values for M-SR (M = Cr and W) in the gas phase and in acetonitrile have been computed at DFT level. Although there is not a linear correlation between the calculated proton affinities and the measured p K a s, the calculations reveal that when solvent effects are taken into account the substituted compounds studied show differences in their proton affinities. There is a good correlation between the change in cavitation energy (Δ G cav ) for the Fischer carbene complexes and log P of the thioalkyl substituents. In proton transfer reactions with amines, steric effects are more important for W complexes with respect to their Cr analogues as a consequence of differences in transition state progress. On the other hand, in reactions with OH − , hydrophobicity of the R substituent is responsible for the observed changes in intrinsic kinetic acidities, which is supported by the good correlation obtained between log k 0 and log P . W complexes are more sensitive to hydrophobic effects due to the tighter solvation sphere with respect to their Cr counterparts. However, in the limit of log P = 0, the energy involved in the solvent reorganization process is the same regardless of the metal . The hydrophobicity of the R substituent is responsible for the observed changes in intrinsic kinetic acidities.