> as lemmas

1872 Jrnl. Chem. Soc. 25 446 The first members of the group of compounds, now generally described as the isocyanates and isocyanurates, were discovered by Wurtz in the ethyl and methyl series.

1877 H. Watts Fownes's Man. Elem. Chem. (ed. 12) II. 96 Potassium Cyanate, CNKO..two modifications, viz. NC−OK Normal cyanate, and CO = NK Isocyanate. The normal cyanate..crystallises in long needles, and is converted by fusion into the isocyanate.

1880 E. Cleminshaw tr. C. A. Wurtz Atomic Theory 238 The isomer of urea, isocyanate of ammonium, contains nitrogen in two conditions.

1944 S. J. Smith Princ. Org. Chem. xiv. 312 The alkyl isocyanates are liquids with a powerful stifling odour.

1961 Times 30 May (I.C.I. Suppl.) p. xxii (advt.) Italians need isocyanates for lightweight rigid and flexible polyurethane foams.

1963 in Amer. Speech (1964) 39 146 A dummy man made of material resembling human flesh which has a base of isocyanate rubber.