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 Copy

  
• IUPAC Standard InChIKey: GUBGYTABKSRVRQ-OXMKDSILSA-N Copy
• 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
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• Stereoisomers:
  • Cellobiose
  • α-D-Glucopyranose, 4-O-β-D-galactopyranosyl-
  • D-cellobiose
  • Lactose
  • Maltose
• Other names: Lactose, β-; β-Lactose; 4-O-β-D-Galactopyranosyl-β-D-glucopyranose; beta-Lactose; β-D-Lactose; Lactopress
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• Information on this page:
  • Condensed phase thermochemistry data
  • Reaction thermochemistry data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • References
  • Notes
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Condensed phase thermochemistry data

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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

Constant pressure heat capacity of solid

Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

 +  =  + 

By formula: C₁₂H₂₂O₁₁ + H₂O = C₆H₁₂O₆ + C₆H₁₂O₆

IR Spectrum

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Coblentz Society, Inc.

Condensed Phase Spectrum

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Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.

Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived.

Additional Data

Mass spectrum (electron ionization)

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

References

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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]

Goldberg and Tewari, 1989
Goldberg, R.N.; Tewari, Y.B., A calorimetric and equilibrium investigatino of the hydrolysis of lactose, J. Biol. Chem., 1989, 264, 9897-9900. [all data]

Notes

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• 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
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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