Enhanced Basicity of Push-Pull Nitrogen Bases in the Gas Phase.

摘要: Nitrogen bases containing one or more pushing amino-group(s) directly linked to a pulling cyano, imino, phosphoimino group, as well those in which the and moieties are separated by conjugated spacer (C═X)n, where X is CH N, display an exceptionally strong basicity. The n-π conjugation between groups such systems lowers basicity of increases group. In gas phase, most so-called push–pull nitrogen exhibit very high This paper presents analysis exceptional gas-phase basicity, mostly terms experimental data, relation with structure various subfamilies bases: nitriles, azoles, azines, amidines, guanidines, vinamidines, biguanides, phosphazenes. biomolecules substructure, bioamines, amino acids, peptides contai...