Nomenclature
CAS number: 75-13-8
Carbimide.
CHNO; mol wt 43.02.
C 27.92%, H 2.34%, N 32.56%, O 37.19%.
HN=C=O.
Description and references
Prepn: J. Liebig, F. Whler, Ann. 39, 29 (1846); Steyermark, J. Org. Chem. 28, 586 (1963);
R. Vorhoeve, L. E. Trimble, Science 202, 525 (1978). Crystal structure: Von Dohlen, Carpenter, Acta Crystallogr. 8, 646 (1955).
Review of prepn and properties: D. J. Belson, A. N. Strachan, Chem. Soc. Rev. 11, 41-56 (1982).
See also Cyanic Acid.
Properties
Store in dil solns of carbon tetrachloride or
ether at 30° to slow polymerization. The free acid in the vapor
phase or in ether soln gives no indication of being a mixture, and
all the evidence supports the iso structure, HNCO, whereas in aq soln
cyanic acid HOCN is present: N. V. Sidgwick, The Chemical Elements and Their Compounds vol. I (Oxford, 1950) p 673.Caution
Strongly acidic, will blister skin.