L-Methionine methyl ester hydrochloride
L-Methionine methyl ester hydrochloride (CAS: 2491-18-1) is a derivative of the essential amino acid methionine. With a molecular weight of 199.70 g/mol and a linear formula of CH3SCH2CH2CH(NH2)COOCH3 · HCl, it serves as a valuable building block in chemical synthesis. Its primary applications lie within peptide chemistry and as an intermediate in the development of novel compounds in chemical biology and organic synthesis.

Peptide Synthesis
This compound is employed in the synthesis of peptides, where the methionine ester moiety can be incorporated into peptide chains. Its hydrochloride salt form offers improved stability and handling characteristics.
Chemical Biology Research
Used as a reagent in chemical biology, L-Methionine methyl ester hydrochloride can be utilized in studies investigating biological pathways or as a component in the synthesis of probes for biochemical research.
Organic Synthesis Intermediate
It acts as a versatile intermediate in organic synthesis, enabling the construction of more complex molecules. The functional groups present allow for various chemical transformations.
| Molecular weight | 199.70 |
|---|---|
| Linear formula | CH3SCH2CH2CH(NH2)COOCH3 · HCl |
| Assay | 98% |
| Optical activity | [α]22/D +25.9°, c = 1 in H2O |
| Melting point | 151-153 °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 |
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 L-Methionine methyl ester hydrochloride used for?
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L-Methionine methyl ester hydrochloride is primarily used in peptide synthesis, chemical biology research, and as an intermediate in organic synthesis. It is a derivative of the amino acid methionine.
What is the CAS number and formula for L-Methionine methyl ester hydrochloride?
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The CAS number is 2491-18-1. The linear formula is CH3SCH2CH2CH(NH2)COOCH3 · HCl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies L-Methionine methyl ester hydrochloride with an assay of 98%. We do not represent this product as USP, BP, EP, or other pharmacopoeia grades unless explicitly stated.
How should L-Methionine methyl ester hydrochloride be handled?
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L-Methionine methyl ester hydrochloride is classified as an irritant to skin, eyes, and the respiratory system. Handle with appropriate personal protective equipment, including gloves, eye protection, and ensure adequate ventilation. Avoid inhalation of dust and contact with skin and eyes. Refer to the Safety Data Sheet (SDS) for detailed handling information.
Is L-Methionine methyl ester hydrochloride a controlled substance?
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Based on the provided data, L-Methionine methyl ester hydrochloride is not listed as a controlled substance.
How is L-Methionine methyl ester hydrochloride packed and shipped?
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L-Methionine methyl ester hydrochloride is carefully packaged to ensure stability during transit and is exported globally by Tech Serve Solutions, adhering to all relevant shipping regulations.
How can I request a sample or quote for L-Methionine methyl ester hydrochloride?
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To request a sample or a quote, please contact the Tech Serve Solutions sales team through our website or by phone, providing the product name and CAS number (2491-18-1).
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