Butanedione
C4H6O2, 86.09 g/mol. Its structure, the values that were measured, the values that were calculated, and where each one came from.
Identifiers
- Molecular formula
- C₄H₆O₂
- Molecular weight
- 86.09 g/mol
- Exact mass
- 86.036779 g/mol
- IUPAC name
- butane-2,3-dione
- CC(=O)C(C)=O
- InChI=1S/C4H6O2/c1-3(5)4(2)6/h1-2H3
- QSJXEFYPDANLFS-UHFFFAOYSA-N
Measured properties
Values somebody obtained from a sample and published. Where two sources report the same property they are both shown, in the units each used — a disagreement between them is information, and averaging it away would be inventing a number neither one gave.
- Boiling Point
- 190 °F at 760 mmHg (NTP, 1992)
- 87.5 °C
- 87.00 to 88.00 °C. @ 760.00 mm Hg
- 88 °C
- 87-88 °C
- 190 °F
- 88 °C @760 [mm Hg]
- Melting Point
- 27.7 °F (NTP, 1992)
- -1.2 °C
- -2.4 °C
- -2.4 °C
- 27.7 °F
- Flash Point
- 80 °F (NTP, 1992)
- 7 °C (45 °F) - closed cup
- 80 °F (27 °C) (closed cup)
- 6 °C c.c.
- 80 °F
- Solubility
- greater than or equal to 100 mg/mL at 72 °F (NTP, 1992)
- In water, 200 g/L at 20 °C
- Soluble in about 4 parts water
- Readily soluble in all important organic solvents
- Miscible with ether
- For more Solubility (Complete) data for DIACETYL (8 total), please visit the HSDB record page.
- 200 mg/mL at 15 °C
- Solubility in water, g/100ml at 25 °C: 20
- soluble in glycerol and water; miscible with alcohol, propylene glycol, and most fixed oils
- (in ethanol)
- Density
- 0.99 at 59 °F (NTP, 1992) - Less dense than water; will float
- 0.990 at 15 °C/15 °C
- Relative density (water = 1): 1.1
- 0.975-0.990
- 0.99 at 59 °F
- 0.990 @ 15°C
- Vapor Pressure
- 56.8 [mmHg]
- 56.8 mm Hg at 25 °C
- Vapor pressure, kPa at 25 °C: 7.6
- 56.8 [mm Hg] @25 °C
- LogP
- log Kow = -1.34
- -1.34
- -1.34
- -1.34
- Refractive Index
- Index of refraction: 1.3951 at 20 °C.
- 1.393-1.397
Calculated properties
Derived from the structure rather than from a sample. These are reproducible and they are not measurements: a calculated partition coefficient and a measured one can differ by a long way, and where both exist they are listed apart on purpose.
- Molecular weight
- 86.09 g/mol
- Exact mass
- 86.03677943 Da
- XLogP3
- -1.3
- Polar surface area
- 34.1 Ų
- Complexity
- 71
- H-bond donors
- 0
- H-bond acceptors
- 2
- logP
- 0.1644
- Topological polar surface area
- 34.14 Ų
- H-bond donors
- 0
- H-bond acceptors
- 2
- Rotatable bonds
- 1
- Molar refractivity
- 21.362 cm³/mol
- Fraction sp³ carbons
- 0.5
- QED drug-likeness
- 0.4259
What it is made of
Elements
Structure
- Heavy atoms, hydrogen excluded
- 6
- Total atoms, hydrogen included
- 12
- Rings
- 0
- Aromatic rings
- 0
- Stereocentres
- 0
- Formal charge
- 0
Functional groups
Ketone
The molecule in three dimensions
The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.
Reactions it appears in
Other names for it
The systematic name on this record is butane-2,3-dione.
The sources also call it 2,3-butanedione, diacetyl, biacetyl, Butane-2,3-dione, dimethylglyoxal, dimethyl diketone, Dimethyl glyoxal, 2,3-diketobutane, 2,3-dioxobutane, 2,3-Butadione, Glyoxal, dimethyl-.
Structurally related
Where these values came from
chemistry engine
What this page does not claim
The identifiers are what the source record holds, copied rather than recomputed. Measured values are reported as their source gave them, units and all; calculated values are marked as calculated and are not measurements. Where a field is absent the page says so, because a blank cell reads as a zero and a guessed value reads as a fact.
Nothing here is a hazard assessment, a purity statement or advice about handling a sample. A flash point quoted from a safety database is a number somebody published, not a judgement by us about whether this molecule is safe for what you intend.