Pharmaceutical Materials

CAS Number: 55-55-0

Molecular Formula: C7H11NO5S

Molecular Weight: 221.23 g/mol

Appearance: White to light beige powder or colorless needles

Melting Point: 260°C (dec.)

Solubility: Soluble in water, slightly soluble in ethanol, insoluble in ether

Usage: Mainly used as a fast-acting photographic developer.

 

Aspect	Details
Name	4-Methylaminophenol Sulfate
Common Synonyms	p-Methylaminophenol Sulfate, 4-Amino-m-cresol Sulfate, 4-Methylamino-1-hydroxybenzene Sulfate
CAS No.	55-55-0
Molecular Formula	C₇H₁₀NNO₃S (anhydrous form)
Molecular Weight	196.23 g/mol (anhydrous form)
Physical Properties	Appearance: White to off-white crystalline powder Solubility: Soluble in water and ethanol Melting Point (anhydrous): ~200 °C (decomposition) Density: Approx. 1.45 g/cm³
Chemical Properties	Contains a methylamino group (-NHCH₃) and a phenolic hydroxyl group (-OH) Exhibits basicity due to the amino group and acidity from the phenol Forms stable salts (e.g., sulfate) with strong acids
Applications	Used in photography as a developer for black-and-white films Employed in dye synthesis for textiles and leather Utilized in pharmaceuticals as an intermediate for analgesics
Safety Information	GHS Hazards: H301 (toxic if swallowed), H317 (may cause allergic skin reactions) Precautionary Measures: Avoid inhalation and contact with eyes; use PPE Storage: Keep in a cool, dry place away from oxidizing agents

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