Title: D-Gulonic Acid
CAS Registry Number: 20246-33-7
Molecular Formula: C6H12O7
Molecular Weight: 196.16
Percent Composition: C 36.74%, H 6.17%, O 57.09%
Literature References: Prepd as the sodium salt by reduction of sodium glucuronate with sodium amalgam in alkaline medium: Fischer, Piloty, Ber. 24, 525 (1891); from D-gulonic acid g-lactone: Rehorst, Naumann, ibid. 77, 24 (1944).
Properties: [a]D20 -6° (10 min) ® -38.6° (15 days). The free acid forms the lactone spontaneously. pK (25°): 3.68.
pKa: pK (25°): 3.68
Optical Rotation: [a]D20 -6° (10 min) ® -38.6° (15 days)
Derivative Type: Sodium salt
Molecular Formula: C6H11NaO7
Molecular Weight: 218.14
Percent Composition: C 33.04%, H 5.08%, Na 10.54%, O 51.34%
Properties: Crystals. [a]D20 +11.5°. Sol in water.
Optical Rotation: [a]D20 +11.5°
Derivative Type: Calcium salt
Molecular Formula: Ca(C6H11O7)2
Molecular Weight: 430.37
Percent Composition: Ca 9.31%, C 33.49%, H 5.15%, O 52.05%
Properties: [a]D21 -14.45° (c = 1.73). Precipitated from aq soln by alc.
Optical Rotation: [a]D21 -14.45° (c = 1.73)
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