Piroxicam Impurity I
[CAS# 76508-35-5]

Identification

• Name: Piroxicam Impurity I
• Synonyms: 4-Hydroxy-2H-1,2-benzothiazine-3-carboxylic acid 1-methylethyl ester 1,1-dioxide; NSC 642708
• Molecular Formula: C₁₂H₁₃NO₅S
• Molecular Weight: 283.30
• CAS Registry Number: 76508-35-5
• EC Number: 641-725-8

Properties

• Solubility: Very slightly soluble (0.25 g/L) (25 ºC), Calc.^*
• Density: 1.444±0.06 g/cm³ (20 ºC 760 Torr), Calc.^*
• Melting point: 170 ºC (ethanol )^**

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2014 ACD/Labs)

^** Schapira, Celia B.; Journal of Heterocyclic Chemistry 1980, V17(6), P1281-8.