Table 4.

Solution enthalpies of N-methylbutyrolactam, N-methylvalerolactam, N-methylcaprolactam in proton donor solvents (S), (kJ·mol⁻¹, T = 298.15 K, P = 0.1 MPa) ^a.

Solvent (S)	N-methylbutyrolactam	N-methylvalerolactam	N-methylcaprolactam
Dichloromethane	−8.56 ± 0.05	−8.33 ± 0.05	−7.28 ± 0.04
Chloroform	−19.06 ± 0.09	−19.29 ± 0.07	−17.97 ± 0.05

^a Standard uncertainties u are u(T) = 0.01 K, u(p) = 10 kPa. Uncertainties of solution enthalpies are calculated as a standard deviation of the mean.