β-D-Glucopyranose, 4-O-β-D-galactopyranosyl-
- Formula: C12H22O11
- Molecular weight: 342.2965
- IUPAC Standard InChI: InChI=1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5+,6+,7-,8-,9-,10+,11-,12-/m0/s1
- IUPAC Standard InChIKey: GUBGYTABKSRVRQ-OXMKDSILSA-N
- CAS Registry Number: 5965-66-2
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Stereoisomers:
- Other names: Lactose, β-; β-Lactose; 4-O-β-D-Galactopyranosyl-β-D-glucopyranose; beta-Lactose; β-D-Lactose; Lactopress
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Condensed phase thermochemistry data
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | -2236.7 ± 0.71 | kJ/mol | Ccb | Clarke and Stegeman, 1939 | Reanalyzed by Cox and Pilcher, 1970, Original value = -2235.8 kJ/mol; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -5629.45 ± 0.50 | kJ/mol | Ccb | Clarke and Stegeman, 1939 | Corresponding ΔfHºsolid = -2236.8 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 386.2 | J/mol*K | N/A | Anderson and Stegeman, 1941 | Extrapolation below 90 K, 94.6 J/mol*K.; DH |
| S°solid,1 bar | 403.3 | J/mol*K | N/A | Furtsch and Stegeman, 1936 | Extrapolation below 90 K, 26.00 cal/mol*K.; DH |
Constant pressure heat capacity of solid
| Cp,solid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 399.78 | 289.44 | Anderson and Stegeman, 1941 | T = 65 to 290 K. Value is unsmoothed experimental datum.; DH |
| 408.27 | 298.44 | Furtsch and Stegeman, 1936 | T = 83 to 298 K. Value is unsmoothed experimental datum.; DH |
References
Go To: Top, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Clarke and Stegeman, 1939
Clarke, T.H.; Stegeman, G.,
Heats of combustion of some mono- and disaccharides,
J. Am. Chem. Soc., 1939, 61, 1726-1730. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]
Anderson and Stegeman, 1941
Anderson, A.G.; Stegeman, G.,
The heat capacities and entropies of three disacchardes,
J. Am. Chem. Soc., 1941, 63, 2119-2121. [all data]
Furtsch and Stegeman, 1936
Furtsch, E.F.; Stegeman, G.,
The heat capacity and entropy of b-lactose,
J. Am. Chem. Soc., 1936, 58, 881-882. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,solid Constant pressure heat capacity of solid S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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