Nomenclature
CAS number: 420-05-3
Hydrogen cyanate.
CHNO; mol wt 43.02.
C 27.92%, H 2.34%, N 32.56%, O 37.19%.
Description and references
Best prepd in the laboratory by dry distillation
of cyanuric acid: Linhard, Z. Anorg. Allg.
Chem. 236, 200 (1938). See also Isocyanic Acid.
Properties
Liquid. Acrid odor, strong
lacrimator and vesicant. d420 1.140; d4-20 1.156.
mp -86°. bp760 23.5°. Heat of formation -36.5 kcal/mol. Dipole moment 1.592. pK (20°) 3.66. Rapid
heating of the liquid may result in an explosion. Polymerizes on
standing forming cyamelide and cyanuric acid. Sol in water with decompn
to carbon dioxide and ammonia. Dil solns in ice water may be kept
for several hours. Dil solns in ether, benzene, toluene can be kept
for several weeks.Caution
Highly irritating to eyes, skin,
and mucous membranes. See Clinical
Toxicology of Commercial Products, R. E. Gosselin et al., Eds. (Williams & Wilkins, Baltimore, 5th ed., 1984)
Section II, p 110.Use
In formation of some cyanates.