Table 2.

Solvation enthalpies of γ-butyrolactam (Bu), N-methylbutyrolactam (NMBu), δ-valerolactam, (Va), N-methylvalerolactam (NMVa) and ε-caprolactam (Ca), N-methylcaprolactam (NMCa) in proton acceptor solvents, and evaporation enthalpies of cyclic amides (kJ·mol⁻¹, T = 298.15 K, P = 0.1 MPa) ^a.

Solvent (S)	Bu	NMBu	Va	NMVa	Ca	NMCa
Acetone	−70.0 ± 1.3	−57.6 ± 0.6	−64.8 ± 1.3	−58.4 ± 0.4	−67.9 ± 0.6	−62.0 ± 0.2
Acetonitrile	−68.3 ± 1.3	−58.1 ± 0.6	−64.7 ± 1.4	−59.1 ± 0.4	−67.5 ± 0.6	−62.6 ± 0.2
Ethyl acetate	−67.8 ± 1.3	−57.4 ± 0.6	−63.9 ± 1.3	−57.6 ± 0.4	−67.0 ± 0.6	−61.4 ± 0.2
Tetrahydrofurane	−68.6 ± 1.3	−54.8 ± 0.6	−64.7 ± 1.3	−58.3 ± 0.4	−68.7 ± 0.6	−61.6 ± 0.2
Pyridine	−74.0 ± 1.3	−58.6 ± 0.6	−70.7 ± 1.3	−62.8 ± 0.4	−74.0 ± 0.6	−65.5 ± 0.2
${\mathsf{\Delta }}_{\mathrm{cr},\mathrm{l}}^{\mathrm{g}}{H}^{\mathrm{A}}$	73.7 ± 1.3 b	56.4 ± 0.6 b	78.7 ± 1.3 b	59.9 ± 0.4 b	87.9 ± 0.6 b	63.0 ± 0.2 b

^a Standard uncertainties u are u(T) = 0.01 K, u(p) = 10 kPa. ^b Enthalpies of vaporization and sublimation (${\mathsf{\Delta }}_{\mathrm{cr},\mathrm{l}}^{\mathrm{g}}{H}^A$) taken from Table S4.