2-Methyl-5-phenyl-3-(3-sulfopropyl)benzoxazolium hydroxide inner salt
2-Methyl-5-phenyl-3-(3-sulfopropyl)benzoxazolium hydroxide inner salt (CAS 66142-15-2) is a heterocyclic organic compound with the molecular formula C17H17NO4S and a molecular weight of 331.39 g/mol. This benzoxazolium derivative serves as a valuable building block in chemical synthesis. Its specific structure lends itself to applications in the development of novel organic materials and pharmaceutical intermediates, contributing to advancements in various scientific research fields.

Organic Synthesis Intermediate
This compound is utilised as a key intermediate in complex organic synthesis pathways. Its unique benzoxazolium structure allows for specific reactions and functional group introductions in the construction of larger molecules.
Heterocyclic Chemistry Research
As a heterocyclic building block, it is employed in academic and industrial research focused on developing new heterocyclic compounds. These efforts often target novel therapeutic agents or advanced material properties.
Material Science Precursor
The compound can act as a precursor in the synthesis of advanced organic materials. Its properties may be leveraged for the development of functional polymers, dyes, or electronic materials.
| Molecular weight | 331.39 |
|---|---|
| Empirical formula | C17H17NO4S |
| Melting point | 286-288 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
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 2-Methyl-5-phenyl-3-(3-sulfopropyl)benzoxazolium hydroxide inner salt used for?
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This compound is primarily used as a building block and intermediate in organic synthesis, particularly in heterocyclic chemistry research and potentially as a precursor for advanced organic materials.
What is the CAS number and chemical formula for this product?
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The CAS number is 66142-15-2 and the chemical formula is C17H17NO4S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this chemical for research and laboratory use. Purity details are available on the product's Certificate of Analysis. We do not represent this product as USP, BP, or EP grade.
What are the main safety concerns when handling this chemical?
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This compound is classified as a warning substance, causing skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Always handle with appropriate personal protective equipment in a well-ventilated area.
How is this chemical packed, shipped, and exported?
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As a global supplier, Tech Serve Solutions packs and exports chemicals in compliance with international shipping regulations. Packaging is designed to ensure product integrity and safety during transit.
How can I request a sample or a quote?
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To request a sample or a quote, please visit the product page on our website and use the 'Request Sample' or 'Request Quote' function, or contact our sales team directly.
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