Vinyloxy radical

Formula: C₂H₃O
Molecular weight: 43.0446
IUPAC Standard InChI: InChI=1S/C2H3O/c1-2-3/h2H,1H2
IUPAC Standard InChIKey: FATAVLOOLIRUNA-UHFFFAOYSA-N
CAS Registry Number: 6912-06-7
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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Species with the same structure:
- CH2CHO
Information on this page:
Data at other public NIST sites:
- Electron-Impact Ionization Cross Sections (on physics web site)
- Gas Phase Kinetics Database
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Gas phase ion energetics data

Data compiled as indicated in comments:
B - John E. Bartmess
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to C₂H₃O⁺ (ion structure unspecified)

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.85	EI	Lambert, Christie, et al., 1968	RDSH

Anion protonation reactions

C₂H₃O^- + =

By formula: C₂H₃O^- + H⁺ = C₂H₄O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1533.1 ± 3.4	kJ/mol	D-EA	Mead, Lykke, et al., 1984	gas phase; Uncertainty: 6 millical/mol (0.26 micro-eV).Dipolebound state at ca. 14.3 cal/mol (5 cm-1); B
Δ_rH°	1531. ± 9.2	kJ/mol	G+TS	Bartmess, Scott, et al., 1979	gas phase; Acid: ethanal. The enol is 9.6 kcal/mol more acidic: Holmes and Lossing, 1982; value altered from reference due to change in acidity scale; B
Δ_rH°	1533. ± 12.	kJ/mol	G+TS	Cumming and Kebarle, 1978	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1505. ± 5.0	kJ/mol	H-TS	Mead, Lykke, et al., 1984	gas phase; Uncertainty: 6 millical/mol (0.26 micro-eV).Dipolebound state at ca. 14.3 cal/mol (5 cm-1); B
Δ_rG°	1502. ± 8.4	kJ/mol	IMRE	Bartmess, Scott, et al., 1979	gas phase; Acid: ethanal. The enol is 9.6 kcal/mol more acidic: Holmes and Lossing, 1982; value altered from reference due to change in acidity scale; B
Δ_rG°	1505. ± 8.4	kJ/mol	IMRE	Cumming and Kebarle, 1978	gas phase; B

References

Go To: Top, Gas phase ion energetics data, Notes

Lambert, Christie, et al., 1968
Lambert, R.M.; Christie, M.I.; Golesworthy, R.C.; Linnett, J.W., Mass spectrometric study of the reaction of nitrogen atoms with acetaldehyde, Proc. Roy. Soc. (London), 1968, A302, 167. [all data]

Mead, Lykke, et al., 1984
Mead, R.D.; Lykke, K.R.; Lineberger, W.C.; Marks, J.; Brauman, J.I., Spectroscopy and Dynamics of the Dipole-Bound State of Acetaldehyde Enolate., J. Chem. Phys., 1984, 81, 11, 4883., https://doi.org/10.1063/1.447515 . [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Holmes and Lossing, 1982
Holmes, J.L.; Lossing, F.P., Heats of formation of the ionic and neutral enols of acetaldehyde and acetone, J. Am. Chem. Soc., 1982, 104, 2648. [all data]

Cumming and Kebarle, 1978
Cumming, J.B.; Kebarle, P., Summary of gas phase measurements involving acids AH. Entropy changes in proton transfer reactions involving negative ions. Bond dissociation energies D(A-H) and electron affinities EA(A), Can. J. Chem., 1978, 56, 1. [all data]

Notes

Go To: Top, Gas phase ion energetics data, References

Symbols used in this document:

Δ_rG° Free energy of reaction at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions