Kamlet-Taft solvent parameters

There are three Kamlet-Taft solvent parameters: α (hydrogen bond donor), β (hydrogen bond acceptor), and π^* (polarizability).
The values of α have been set to 0 for solvents that are assumed to be unable to donate hydrogen bonds. This truncation at 0 is the main reason it differs from other measures of hydrogen bond acidity such as E_T and AN.

Occasionally a "polarity correction term" (fudge factor), δ, is seen in correlations. For aromatics δ=1.0, for polychlorinated compounds δ=0.5, and for all other solvents δ=0.0 . If possible this type of ad hoc parameters should be avoided and separate correlations used for different solvent classes.

α is correlated with →Dimroth-Reichardt E_T (→E_T vs α) and →Gutmann AN (→AN vs α).
β is correlated with →Gutmann DN (→DN vs β) except for amines and sulfides.
π^* is correlated with →Catalán SPP (→SPP vs π^*).

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Name	Formula	α	β	π^*	🏷 Tag
ethyl trichloroacetate	C₄H₅Cl₃O₂	0.00	0.25	0.61	halo ester
oxolan-2-one	C₄H₆O₂	0.00	0.49	0.87	ester
4-methyl-2-oxo-1,3-dioxolane	C₄H₆O₃	0.00	0.40	0.83	ester
acetic anhydride	⋮	0.00	0.29	0.76
ethyl chloroacetate	C₄H₇ClO₂	0.00	0.35	0.70	halo ester
butanenitrile	C₄H₇N	0.00	0.40	0.71	nitrile
2-pyrrolidone	C₄H₇NO	0.36	0.77	0.85	amide
bis(2-chloroethyl) ether	C₄H₈Cl₂O	0.00	0.40	0.82	halo ether
2-butanone	C₄H₈O	0.06	0.48	0.67	ketone
tetrahydrofuran	⋮	0.00	0.55	0.58	ether
thiolane-1-oxide	C₄H₈OS	0.00	0.81	1.06
butanoic acid	C₄H₈O₂	1.10	0.45	0.56	carboxylic_acid
dioxane	⋮	0.00	0.37	0.55	ether
ethyl acetate	⋮	0.00	0.45	0.55	ester
methyl propanoate	⋮	0.00	0.27	…	ester
sulfolane	C₄H₈O₂S	0.00	0.39	0.98
thiolane	C₄H₈S	0.00	0.44	0.62
1-bromobutane	C₄H₉Br	0.00	0.13	0.50	halo
1-chlorobutane	C₄H₉Cl	0.00	0.00	0.39	halo
1-iodobutane	C₄H₉I	0.00	0.23	0.47	halo amine
pyrrolidine	C₄H₉N	0.16	0.70	0.39
morpholine	C₄H₉NO	0.29	0.70	0.39	ether amine
N,N-dimethylacetamide	⋮	0.00	0.76	0.88	amide
2-butanol	C₄H₁₀O	0.69	0.80	0.40	alcohol
2-methyl-1-propanol	⋮	0.79	0.84	0.40	alcohol