Description

L-Cysteine, S,2-Dimethyl- (9Ci) is a specialized, high-purity derivative of the amino acid L-cysteine, characterized by its dimethyl substitution on the sulfur atom. This structural modification is critical for enhancing stability and modulating reactivity, making it a valuable building block in advanced chemical synthesis and pharmaceutical research. It is primarily utilized by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and fine chemical industries for applications requiring precise molecular control.

Application

• Pharmaceutical Intermediate: Serves as a key chiral synthon in the research and development of novel active pharmaceutical ingredients (APIs), particularly in peptidomimetics and enzyme inhibitors.
• Biochemical Research: Used as a modified cysteine analog in proteomics and molecular biology studies to investigate protein structure, function, and folding mechanisms.
• Agrochemical Synthesis: Acts as a precursor in the development of specialized pesticides and herbicides where the thioether functionality is essential for bioactivity.
• Fine Chemical Production: Employed in the synthesis of complex organic molecules, including ligands for catalysis and advanced materials, leveraging its unique stereochemistry.
• Peptide Chemistry: Provides a protected or modified cysteine residue for solid-phase peptide synthesis (SPPS), enabling the construction of peptides with enhanced stability or specific properties.

Basic Information

Product Name	L-Cysteine, S,2-Dimethyl- (9Ci)
CAS No.	111003-29-3
Molecular Formula	C5H11NO2S
Molecular Weight	149.21 g/mol
Synonyms	S,2-Dimethyl-L-cysteine; (2R)-2-Amino-3-(methylsulfinyl)propanoic acid; L-2-Amino-3-(methylsulfinyl)propionic acid; Methyl L-cysteine sulfoxide; S-Methyl-L-cysteine sulfoxide; (R)-2-Amino-3-(methylsulfinyl)propanoic acid
EINECS	Contact for details

Quality Control

Every batch of L-Cysteine, S,2-Dimethyl- (9Ci) is produced under a strict quality management system. Our products undergo rigorous analytical testing, including chiral purity verification and impurity profiling, to ensure they meet the exacting standards required for research and synthesis. A comprehensive Certificate of Analysis (COA) detailing identity, purity (typically ≥97% by HPLC), and specific tests is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). This compound is hygroscopic (moisture-sensitive); keep the container tightly sealed under an inert atmosphere if necessary to maintain stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Optical Rotation	Contact for details
Chiral Purity	≥ 99.0% ee
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.