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1H-Pyrazol-5(4H)-one [137-44-0]

Name 1H-Pyrazol-5(4H)-one
Synonyms 2,4-Dihydro-3H-pyrazol-3-one; 5-Pyrazolone; NSC 243823
Molecular Structure CAS # 137-44-0, 1H-Pyrazol-5(4H)-one, 2,4-Dihydro-3H-pyrazol-3-one, 5-Pyrazolone, NSC 243823
Molecular Formula C3H4N2O
Molecular Weight 84.08
CAS Registry Number 137-44-0
Solubility Freely soluble (108 g/L) (25 ºC), Calc.*
Density 1.44±0.1 g/cm3 (20 ºC 760 Torr), Calc.*
Melting point 268 ºC**
Boiling point 143-144 ºC (0.3 Torr)***
* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2013 ACD/Labs)
** Clemo, George R.; Journal of the Chemical Society 1934, P1739-41.
*** Makisumi, Yasuo; Tetrahedron Letters 1966, (52), P6413-17.
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