SUPERBASES IN THE GAS-PHASE - AMIDINE AND GUANIDINE DERIVATIVES WITH PROTON AFFINITIES LARGER THAN 1000 KJ MOL-1

By building a relative basicity ladder, the current basicity scale (Lias et al., J. Phys. Chem. Ref. Data, 17 Suppl. No. 1 (1988)) has been reexamined in its upper part, and extended for organic compounds (amenable to proton transfer measurements) up to proton affinity, PA = 1050 kJ mol-1. Structural effects involved in superbasicities are briefly discussed and routes to further extension of the gas-phase basicity scale for organic compounds are proposed.