pseudo-acidn.adj.

1899 Jrnl. Chem. Soc. 76 i. 399 The author [sc. Hantzsch] describes as pseudo-acids those substances which do not contain a hydrogen atom directly displaceable by metals, but which are capable of changing into a salt-forming isomeride.

1929 P. Walden Salts, Acids, & Bases v. 127 In the homogeneous condition pseudo-acids are associated, usually in the dimolecular form. The carboxylic acids are typical pseudo-acids.

1952 E. E. Turner & M. M. Harris Org. Chem. ix. 135 Primary and secondary nitroparaffins are pseudo-acids, dissolving in aqueous alkali..to give the ions of the aci-nitroparaffin or true (nitronic) acid.

1981 P. Sykes Guidebk. to Mechanism in Org. Chem. (ed. 5) x. 277 An interesting situation arises with aliphatic nitrocompounds, e.g. phenylnitromethane... Here the normal nitro—pseudo-acid—form..is the more stable of the two.

1930 Proc. Royal Soc. A. 129 539 There is a tautomeric change from the true acidic form,..XOH, to the pseudo-acidic HXO.

1953 C. K. Ingold Struct. & Mech. Org. Chem. x. 576 The pseudo-basic carbinol corresponds to the pseudo-acidic phenylnitromethane.

1998 Analytica Chimica Acta 361 207/1 Its [sc. imidazole's] weakly acidic (pseudoacidic) properties emanate from the presence of an unsubstituted imino group.

1910 N. V. Sidgwick Org. Chem. Nitrogen vii. 144 The nitroparaffins are typical instances of pseudo-acids. In fact it was in this connexion that Hantzsch developed the theory of pseudo-acidity.

1927 Ann. Rep. Progr. Chem. 24 115 In mobile cation tautomerism the hydrogen ion forms a more or less stable covalent link with (negative) carbon, whereas the sodium ion tends to remain in the electrovalent state (thus giving rise to the phenomena of pseudo-acidity).

2000 Jrnl. Amer. Chem. Soc. 122 1359/1 The pseudo-acidity constants..were determined spectrophotometrically.