Derivative Type: Sodium salt
CAS Registry Number: 525-86-0
Percent Composition: C 50.29%, H 5.73%, N 8.38%, Na 6.88%, O 19.14%, S 9.59%
Properties: Crystals. A trihydrate and a sesquihydrate have been obtained. The anhydr form exists in two cryst modifications. Usually long, fine, blunt-ended needles from water + butanol. After drying in vacuo over P2O5 and then at 55-60° in high vacuum: mp 204-205° (with decompn, open capillary in block preheated to 200°). [a]D25 +316° (c = 0.88). pK in water at 5° = 2.83; at 25° = 2.87. Very sol in water, in isotonic sodium chloride soln and in glucose solns; also sol in alcohol, but is inactivated by this solvent, likewise by glycerol and other primary alcohols. Insol in benzene, carbon tetrachloride, liquid petrolatum.
Melting point: mp 204-205° (with decompn, open capillary in block preheated to 200°)
pKa: pK in water at 5° = 2.83; at 25° = 2.87
Optical Rotation: [a]D25 +316° (c = 0.88)
Status: This monograph has been retired and is no longer subject to revision or update.
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