Acetone azine is the simplest ketazine. It is an intermediate in some hydrazine manufacturing processes.

Acetone azine[1][2]
Aceto azine Structural Formula V1.svg
Acetone azine Ball and Stick.png
Acetone azine Space Fill.png
Preferred IUPAC name
Systematic IUPAC name
Acetone azine
Other names

Acetone ketazine
Dimethyl ketazine
2-Propanone, 2-(1-methylethylidene)hydrazone
Acetone isopropylidenehydrazone
Diisopropylidene hydrazine

3D model (JSmol)
ECHA InfoCard 100.010.009
EC Number
  • 211-009-6
Molar mass 112.17 g mol−1
Appearance Pale-yellow liquid
Density 0.842 g cm−3
Melting point −125 °C (−193 °F; 148 K)
Boiling point 133 °C (271 °F; 406 K)
GHS pictograms GHS02: Flammable GHS08: Health hazard GHS06: Toxic
GHS Signal word Danger
H226, H302, H311, H315, H319, H335, H350
P201, P261, P280, P305+351+338, P308+313
NFPA 704 (fire diamond)
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Flash point 31 °C (88 °F; 304 K)
Related compounds
Related compounds


Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references


Acetone azine can be prepared from acetone and hydrazine:[3]

2 (CH3)2CO + N2H4 → 2 H2O + [(CH3)2C=N]2

It can also be produced from acetone (2 eq.), ammonia (2 eq.) and hydrogen peroxide (1 eq.).[4] The first step is the formation of acetone imine, Me2C=NH; this is then oxidized by hydrogen peroxide through a complex mechanism to give 3,3-dimethyloxaziridine, which reacts with a further molecule of ammonia to produce acetone hydrazone. The hydrazone then condenses with a further molecule of acetone to produce the azine. The acetone azine product is distilled out of the reaction mixture as its azeotrope with water (n(H2O)/n(azine) ≈ 6).[5]


Acetone azine can be used to prepare acetone hydrazone[3] and 2-diazopropane.[6]


Hydrazine can be produced through acid-catalysed hydrolysis of acetone azine:[7]

2 H2O + [(CH3)2C=N]2 → 2 (CH3)2CO + N2H4


  1. ^ "Acetone azine MSDS (Santa Cruz Biotechnology)" (PDF).
  2. ^ "Acetone azine MSDS (Sigma Aldrich)".
  3. ^ a b Day, A. C.; Whiting, M. C. "Acetone Hydrazone". Organic Syntheses.; Collective Volume, 6, p. 10
  4. ^ US 3972878, Schirmann, Jean-Pierre; Jean Combroux & Serge Yvon Delavarenne, "Method for preparing azines and hydrazones", issued 1976-08-03, assigned to Produits Chimiques Ugine Kuhlmann .US 3978049, Schirmann, Jean-Pierre; Pierre Tellier & Henri Mathais et al., "Process for the preparation of hydrazine compounds", issued 1976-08-31, assigned to Produits Chimiques Ugine Kuhlmann 
  5. ^ US 4724133, Schirmann, Jean-Pierre; Jean Combroux & Serge Y. Delavarenne, "Preparation of a concentrated aqueous solution of hydrazine hydrate", issued 1988-02-09, assigned to Atochem 
  6. ^ Organic Syntheses, Coll. Vol. 6, p.392 (1988); Vol. 50, p.27 (1970). Link
  7. ^ Gilbert, E. C. (1929), "Studies on Hydrazine. The Hydrolysis of Dimethylketazine and the Equilibrium between Hydrazine and Acetone", J. Am. Chem. Soc., 51 (11): 3394–3409, doi:10.1021/ja01386a032.