Diketene
C4H4O2, 84.074 g/mol. Its structure, the values that were measured, the values that were calculated, and where each one came from.
Identifiers
- Molecular formula
- C₄H₄O₂
- Molecular weight
- 84.074 g/mol
- Exact mass
- 84.021129 g/mol
- C=C1CC(=O)O1
- InChI=1S/C4H4O2/c1-3-2-4(5)6-3/h1-2H2
- WASQWSOJHCZDFK-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
- 127 °C
- 127 °C
- 126.1 °C @760 [mm Hg]
- Melting Point
- -6.5 °C
- Heat of Fusion at Melting Point = 1.44X10+7 Joules kmol
- -7 °C
- -6.5 °C
- Flash Point
- 93 °F (NFPA, 2010)
- 90 °F
- 93.2 °F (34 °C) - closed cup
- 93 °F (33.9 °C) - open cup
- 93 °F (34 °C) - closed cup
- 33 °C c.c.
- Solubility
- Very slightly soluble in water in which it decomposes slowly
- Miscible with most organic solvents. Miscible with hexane
- Slightly soluble in aliphatic hydrocarbons such as hexane (ca. 12.5 wt% at 23 °C), octane, cyclohexane, and methyl cyclohexane
- Soluble in common organic solvents
- Solubility in water at 25 °C: slowly hydrolyzes
- Density
- 1.0877 g/cu cm at 20 °C
- Density (at 20 °C): 1.09 g/cm³
- Relative density of the vapour/air-mixture at 20 °C (air = 1): 1.02
- 1.0877 @ 20°C
- Vapor Pressure
- 10.7 [mmHg]
- VP: 1.07 kPa at 20 °C
- 10.7 mm Hg at 25 °C
- Vapor pressure, kPa at 20 °C: 1
- 7.5 [mm Hg] @19.3 °C
- Viscosity
- 0.88 mPa.s
- Refractive Index
- Index of refraction: 1.4342 at 23 °C/D
- Index of refraction: 1.439 at 20 °C/D
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.
- logP
- 0.447
- Topological polar surface area
- 26.3 Ų
- H-bond donors
- 0
- H-bond acceptors
- 2
- Rotatable bonds
- 0
- Molar refractivity
- 19.849 cm³/mol
- Fraction sp³ carbons
- 0.25
- QED drug-likeness
- 0.3981
What it is made of
Elements
Structure
- Heavy atoms, hydrogen excluded
- 6
- Total atoms, hydrogen included
- 10
- Rings
- 1
- Aromatic rings
- 0
- Stereocentres
- 0
- Formal charge
- 0
Functional groups
Ester
Ether
Alkene
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 sources also call it 4-Methylene-2-oxetanone, 2-Oxetanone, 4-methylene-, Ketene, dimer, 3-Buteno-beta-lactone, Vinylaceto-beta-lactone, 3-Butenoic acid, 3-hydroxy-, beta-lactone, Acetyl ketene, 4-methylideneoxetan-2-one, 4-methyleneoxetan-2-one, Ethenone, dimer, Ketene dimer, Diketen.
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.