Description

Thionitrous Acid (Hnos), S-4-Pyridinyl Ester (9Ci) is a specialized organosulfur-nitrogen compound with the CAS registry number 741242-07-9. This chemical serves as a valuable synthetic intermediate and building block in advanced organic synthesis, enabling the construction of complex heterocyclic systems. It is primarily utilized by research chemists and process development scientists in the pharmaceutical and agrochemical industries for the development of novel active ingredients and functional materials.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of novel drug candidates, particularly those targeting neurological and oncological pathways.
• Agrochemical Research: Used in the development of new pesticides and herbicides, leveraging its unique sulfur-nitrogen-pyridine scaffold.
• Ligand Synthesis: Serves as a starting material for creating specialized ligands used in catalysis and metal-organic frameworks (MOFs).
• Material Science: Employed in the research of advanced polymers and functional materials with specific electronic or photonic properties.
• Chemical Biology Probes: Useful for synthesizing molecular probes to study enzyme mechanisms and biological pathways.
• Academic & Industrial R&D: A versatile reagent for methodological development and exploratory chemistry in research laboratories worldwide.

Basic Information

Product Name	Thionitrous Acid (Hnos), S-4-Pyridinyl Ester (9Ci)
CAS No.	741242-07-9
Molecular Formula	C5H4N2O2S
Molecular Weight	156.16 g/mol
Synonyms	S-(Pyridin-4-yl) thionitrite; 4-Pyridinyl thionitrous acid ester; Thionitrous acid S-4-pyridyl ester; HNOS S-4-Pyridinyl ester; 9CI Identifier Compound; 4-Pyridyl thionitrite; Pyridine-4-thionitrous acid ester; CAS 741242-07-9
EINECS	Contact for details

Quality Control

We maintain stringent quality control protocols for all our fine chemical intermediates. Production of Thionitrous Acid (Hnos), S-4-Pyridinyl Ester (9Ci) is monitored through in-process controls and final batch analysis to ensure consistency and purity. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with each shipment, supporting your R&D and quality assurance requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (typically 15-25°C). This compound may be sensitive to moisture and prolonged exposure to air; keep the container tightly sealed under an inert atmosphere when not in use.

Specification

Item	Specification
Appearance	White to off-white solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Related Substances (HPLC)	Total impurities ≤ 5.0%
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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