carbodiimiden.
/ˌkɑːbə(ʊ)dʌɪˈɪmʌɪd/, U.S. /ˌkɑrbəˌdaɪˈɪmaɪd/ Chemistry.
Originally: the compound HN=C=NH, a tautomeric form of cyanamide (now rare). In later use: any of a class of compounds having the general formula RN=C=NR′, characterized by a carbon atom doubly bonded to two nitrogen atoms each bearing an organic group.
ΚΠ
1877 H. Watts Fownes's Man. Chem. (ed. 12) II. 106 In this and most of its reactions it [sc. cyanamide] behaves as if it had the structure of carbodiimide.
1899 Jrnl. Amer. Chem. Soc. 21 139 The carbodiimide must be freshly prepared, since any polymerization that has occurred lessens the yield of the ether.
1954 Proc. Royal Soc. A. 226 80 If a carbodiimide is allowed to react with a mixture of two different phosphoric acids, however, some unsymmetrical pyrophosphate is usually produced.
2002 A. G. Mayes in E. Gizeli & C. R. Lowe Biomolecular Sensors iv. 67 (caption) Formation of an amide bond by activation of a carboxylic acid with a carbodiimide reagent followed by nucleophilic displacement with the amine.
This is a new entry (OED Third Edition, December 2008; most recently modified version published online December 2021).
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n.1877