Abstract
A
1
H and
13
C NMR study of the equilibrium mixtures of benzotriazole and several carbonyl compounds with their adducts, in [
2
H
6
]benzene and other solvents, affords the equilibrium constants for the reversible formation of N-1 (
K
1
) and N-2 (
K
2
) isomeric adducts. Thermodynamic parameters have been computed. Adduct formation is generally less predominant in sterically crowded cases. In general the N-1 isomer predominates over the N-2 isomer, however, with the sterically hindered 4,7-dimethylbenzotriazole this order is reversed.