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HONGKUN / PRODUCT DIRECTORY

3,5-Dichloro-4-pyridone-1-acetic acid | CAS 56187-37-2

The N-acetic acid side chain of this dichloropyridone provides a defined precursor context for published cephem chemistry; buyers should distinguish the free acid from carboxylate records and verify the ring substitution pattern.

CAS56187-37-2
Molecular formulaC7H5Cl2NO3

Product overview

The acetic acid chain is attached through the nitrogen of the 3,5-dichloro-4-pyridone ring. This connectivity defines CAS 56187-37-2 and distinguishes it from aromatic acids with a carboxyl group directly on the ring. The requested material is the free acid without an external counterion. It appears as a precursor for certain cephem derivatives in the published pyridone-acetic acid patent. For procurement, state the N-linked chain, both chlorine positions and the free-acid form together. Check agreement among structure, formula and assay basis in the quotation, specification and batch documents.

Chemical identity

Chemical name
3,5-Dichloro-4-pyridone-1-acetic acid
CAS number
56187-37-2
Molecular formula
C7H5Cl2NO3

Application context

3,5-Dichloro-4-pyridone-1-acetic acid has been described as an intermediate for the preparation of cephem derivatives. The N-linked acetic acid supplies a carboxyl-containing side-chain fragment attached to the dichloropyridone ring. When selecting it for route development, confirm the N linkage, 3,5-dichloro pattern and free-acid form against the target intermediate. Specify a method that distinguishes related pyridones, together with the acid-content basis used for quantitative charging.

Chemistry and synthetic role

The molecule contains a pyridone carbonyl and an N-linked carboxymethyl group. Its two chlorine substituents occupy positions 3 and 5. An acid, its anion and a specified salt should not share unqualified formula or assay statements.

Quality review

Confirm the free-acid form

Match the full structure and formula with the proposed specification. State any salt or counterion separately and agree the corresponding assay basis.

Confirm N-acetic acid connectivity

Use appropriate identity evidence to distinguish N-linked acetic acid from ring-carboxylated or positionally different compounds.

Separate acid assay from impurity profiling

A titration can address acid equivalents but cannot replace a method resolving related pyridones and positional analogues.

Preparing a specification

Specify the free acid under CAS 56187-37-2, with the complete 3,5-dichloro-4-pyridone structure. Agree assay basis and related-substance methods; require consistent chemical-form information across the quotation, specification and COA.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, quantity and destination. Agree storage and handling conditions using the actual supplied material’s SDS and label.

Documentation

Request the proposed specification, batch COA, SDS and structural identification for the free acid. Confirm availability of the assay method and chromatograms separating relevant pyridone compounds.

Procurement questions

Is a carboxylate record equivalent to the free acid?

It represents a different protonation form; a specific salt also requires its counterion and stoichiometry.

Which structural features define the side-chain precursor?

The N-linked acetic acid chain, 3,5-dichloro-4-pyridone ring and free-acid form should match the intended route input.

Why confirm the N linkage?

A ring-carboxylated aromatic acid has different connectivity even if some naming fragments are similar.

Technical sources
  1. PubChem CID92052: 3,5-Dichloro-4-pyridone-1-acetic acidNCBI / PubChem
  2. CAS56187-37-2 catalogue aggregate and Thermo Scientific product rowFisher Scientific / Thermo Scientific Chemicals
  3. 3,5-Dichloro-4-pyridone-1-acetic acidSanta Cruz Biotechnology
  4. US4243810: Pyridone-acetic acid derivative — abstract listed under inventor Werner RogalskiUSPTO patent abstract reproduced by Justia