imiden.

1850 C. G. B. Daubeny Introd. Atomic Theory (ed. 2) viii. 248 Imidogen, by which name Laurent intended to express ammonia shorn of 2 of its hydrogen atoms.

1857 W. A. Miller Elements Chem. III. 231 The imides are bodies formed from the amidated acids by depriving these compounds of two equivalents of water.

1865–72 H. Watts Dict. Chem. III. 246 Imides, monamides, in which 2 at. hydrogen are replaced by a diatomic radicle.

1869 Eng. Mech. 2 July 339/1 Imides..bodies intermediate between the amides and nitrites, supposed to contain a hypothetical radicle, imidogen.

1892 E. F. Smith tr. V. von Richter Chem. Carbon Compounds (ed. 2) 365 The imides result by substituting the divalent acid radicals for two of the hydrogen atoms of ammonia.

1950 N. V. Sidgwick Chem. Elements I. 666 Imides proper R·C^_^OH_NH (cyclic imides like phthalimide are of course of a different type) are scarcely known except as possible tautomeric forms of amides; their alkyl derivatives, the imino-ethers R·C^_^O·R_N·R , change easily and irreversibly into the disubstituted amides R·C^_^O_NR2.

1951 C. R. Noller Textbk. Org. Chem. xiii. 195 The monoacyl derivatives of ammonia, primary amines and secondary amines, having the general formula RCONH₂, RCONHR, or RCONR₂, are known as amides. Diacyl derivatives of ammonia, (RCO)₂NH, and of primary amines, (RCO)₂NR, also are known and are called imides. Except for the cyclic imides..their preparation usually is more difficult.

1962 P. J. Durrant & B. Durrant Introd. Adv. Inorg. Chem. xix. 695 The imides, for example lithium imide Li₂NH, contain the group >NH. Lithium, calcium, germanium, tin, and lead form imides.

1881 H. Watts Dict. Chem. VIII. 381 The products are imidocaprylic acid and imidocaprylimide.