7961. 2-Pyrazoline

Nomenclature

CAS number: 109-98-8
4,5-Dihydro-1H-pyrazole.
C3H6N2; mol wt 70.09.
C 51.41%, H 8.63%, N 39.97%.

Description and references

Prepn from ethylene and diazomethane: Azzarello, Atti Accad. Lincei [5] 14, II, 285 (1905).

Chemical structure

Properties

Liquid. Faint amine odor. An odor resembling chocolate has been detected in some prepns. d417 1.0200. bp760 144°. Volatile with steam. n58717.2 1.4796. Miscible with water, alc.