4-(Methylamino)phenol hemisulfate salt
4-(Methylamino)phenol hemisulfate salt (CAS: 55-55-0, Formula: C7H9NO · 1/2H2SO4) is a high-purity chemical compound with a molecular weight of 172.19 g/mol. Supplied as an ACS reagent grade, this compound is primarily utilised as an organic building block in chemical synthesis. Its suitability for specific analytical tests, such as the determination of phosphate, underscores its role in laboratory applications.
- IUPAC
- Metol

Organic Synthesis Intermediate
Serves as a crucial building block in the synthesis of more complex organic molecules. Its reactive functional groups allow for diverse chemical transformations.
Laboratory Reagent
Utilised in analytical chemistry, including tests for the determination of specific ions like phosphate. Its defined purity ensures reliable experimental results.
Research and Development
Employed in various R&D settings for the exploration of new chemical pathways and material development.
| Molecular weight | 172.19 |
|---|---|
| Linear formula | C7H9NO · 1/2H2SO4 |
| Assay | 99%99.0-101.5% (ACS specification) |
| Grade | ACS reagent |
| Solubility | H2O: soluble50 mg/mL, clear |
| Autoignition temp | 989 °F |
| Impurities tested | ≤1% aminophenol |
| Melting point | 260 °C (dec.)(lit.) |
| Suitability | passes test for determination of phosphate |



Hazard statements
- H302Harmful if swallowed
- H317May cause an allergic skin reaction
- H373May cause damage to organs through prolonged exposure
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P273Avoid release to the environment
- P280Wear protective gloves, clothing and eye/face protection
- P501Dispose of contents and container per local regulations
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn,N |
| Risk statements (R) | 22-43-48/22-50/53 |
| Safety statements (S) | 36/37-46-60-61 |
| Ignition residue | ≤0.1% |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-(Methylamino)phenol hemisulfate salt used for?
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4-(Methylamino)phenol hemisulfate salt is primarily used as a building block in organic synthesis and as a reagent in laboratory applications, including analytical tests like the determination of phosphate.
What are the CAS number and formula for 4-(Methylamino)phenol hemisulfate salt?
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The CAS number for 4-(Methylamino)phenol hemisulfate salt is 55-55-0, and its formula is C7H9NO · 1/2H2SO4.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-(Methylamino)phenol hemisulfate salt in ACS reagent grade, with an assay of 99% (99.0-101.5% ACS specification).
How should 4-(Methylamino)phenol hemisulfate salt be handled safely?
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This compound is harmful if swallowed, may cause an allergic skin reaction, may cause damage to organs through prolonged or repeated exposure, and is toxic to aquatic life with long-lasting effects. Appropriate personal protective equipment, including dust mask type N95, eyeshields, face shields, and gloves, should be used. Handle in a well-ventilated area and avoid release to the environment.
Is 4-(Methylamino)phenol hemisulfate salt a controlled substance?
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The provided data does not indicate that 4-(Methylamino)phenol hemisulfate salt is a controlled substance.
How is 4-(Methylamino)phenol hemisulfate salt packed and exported?
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Tech Serve Solutions, a global supplier and exporter, ensures appropriate packaging for international shipment of chemicals like 4-(Methylamino)phenol hemisulfate salt.
How can I request a quote or sample for 4-(Methylamino)phenol hemisulfate salt?
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Please contact our sales team through the website to request a quote or sample for 4-(Methylamino)phenol hemisulfate salt.
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