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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

2-Chloro-5-(chloromethyl)pyridine | CAS 70258-18-3

The ring chlorine and chloromethyl group serve different purposes in this pyridine intermediate, whose documented imidacloprid chemistry uses the side chain to introduce a chloropyridylmethyl unit through nitrogen alkylation.

CAS70258-18-3
Molecular formulaC6H5Cl2N
Molecular weight162.01 g/mol

Product overview

A pyridine ring bearing chlorine at C2 and chloromethyl at C5 provides the characteristic architecture of CCMP. The side-chain chloride is distinct from the chlorine attached directly to the aromatic ring. Published imidacloprid syntheses use that side chain to attach the chloropyridylmethyl fragment to a nitrogen-containing partner. This identity should be specified in full because other chloromethylpyridine regioisomers and more highly chlorinated side chains are different feedstocks. Neither a chlorine analysis nor a molecular weight check alone establishes the required substitution pattern. Purchasing review should therefore combine structural identity with a chromatographic profile capable of separating relevant side-chain analogues, together with water information where it affects the receiving process.

Chemical identity

Chemical name
2-Chloro-5-(chloromethyl)pyridine
CAS number
70258-18-3
Molecular formula
C6H5Cl2N
Molecular weight
162.01 g/mol

Application context

Imidacloprid routes react CCMP with 2-nitroiminoimidazolidine, using the chloromethyl side chain to introduce the chloropyridylmethyl fragment. The chlorine attached directly to the ring is retained. Qualification should establish the C2-chloro/C5-chloromethyl pattern and separation of relevant side-chain analogues. Agree controls for hydroxymethyl material, precursors or additional chlorination where the actual source process makes them relevant.

Chemistry and synthetic role

Nucleophilic substitution at the chloromethyl carbon creates the C–N connection in the cited route while retaining the ring chlorine. The compound is an alkylating building block, not the imidacloprid active ingredient.

Quality review

Locate both chlorine atoms

Confirm the 2-chloro/5-chloromethyl arrangement with structural identity data, not total halogen content.

Resolve side-chain relatives

Review whether the method separates hydroxymethyl or differently chlorinated congeners if relevant to the manufacturing route.

Set water criteria for the next reaction

Agree a measured water requirement with the process team rather than relying on an unqualified description of dryness.

Preparing a specification

Specify CCMP by CAS and structure, the chromatographic method and assay basis, relevant chloropyridine and side-chain impurity limits, and any water requirement for the receiving alkylation step.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, order quantity and destination. Request the applicable SDS and label to establish storage and handling conditions.

Documentation

Request the proposed specification, batch COA and current SDS. Confirm availability of the identity data and analytical methods relevant to the checks above; documents depend on the selected manufacturer and grade.

Procurement questions

Are the two chlorines equivalent?

No. One is ring-bound and the other belongs to the chloromethyl group used in the cited coupling.

Is CCMP the insecticide itself?

No. It is a defined intermediate appearing in imidacloprid synthesis.

Can total chlorine certify identity?

No. It cannot distinguish regioisomers or locate the chlorine atoms.

Technical sources
  1. PubChem CID 155479 — identity property recordNCBI / PubChem
  2. 2-Chloro-5-(chloromethyl)pyridine C1628Tokyo Chemical Industry
  3. 2-Chloro-5-(chloromethyl)pyridine — crystal structureIUCr / Feng et al.
  4. US7297798B2 — Process for the preparation of imidaclopridUnited States Patent and Trademark Office