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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

2-Chloropyrimidine | CAS 1722-12-9

A C2-chlorinated pyrimidine building block for heteroaryl substitution and coupling chemistry, with identity and related-substance controls focused on the required ring position and any route-specific 2-hydroxypyrimidine limit.

CAS1722-12-9
Molecular formulaC4H3ClN2

Product overview

Chlorine at the carbon between the two ring nitrogen atoms defines the 2-chloropyrimidine scaffold. The compound has no exocyclic amino group and is used to construct pyrimidinyl derivatives in heterocyclic synthesis. Reported work includes pyrimidinyl ethers, heteroarylpyrimidines and fluorescent dyes studied in protein assays. Qualification should confirm the C2 substitution pattern and the related-substance profile. One useful compound to consider during method review is 2-hydroxypyrimidine; specify a separate limit if the receiving route requires its control, with a method that resolves it from the chlorinated starting material.

Chemical identity

Chemical name
2-Chloropyrimidine
CAS number
1722-12-9
Molecular formula
C4H3ClN2

Application context

2-Chloropyrimidine provides a defined heteroaryl starting structure for pyrimidinyl ether and heteroarylpyrimidine synthesis. It also appears in research routes to fluorescent dyes for protein assays and in cobalt-catalysed cross-coupling work. These transformations make the C2 chloro functionality and impurity composition relevant to raw-material selection. When 2-hydroxypyrimidine could affect the chosen process, include it in the related-substance review and agree the analytical separation. Set the acceptance criteria around the actual transformation and the required quality of the downstream intermediate.

Chemistry and synthetic role

The two ring nitrogens flank the carbon bearing chlorine, defining an electron-deficient heteroaryl substitution site. Replacing chlorine with a hydroxy-related functionality gives a different compound; analytical control should discriminate the two when route performance depends on their proportions.

Quality review

Confirm the C2-chloro structure

Use identity evidence that rules out a different chloropyrimidine position or an amino-substituted analogue.

Discuss 2-hydroxypyrimidine explicitly

Where the route requires control of 2-hydroxypyrimidine, define its individual limit and confirm that the analytical method resolves and quantifies it.

Clarify what the assay measures

Agree whether the result is chromatographic area or quantitative content and how unknown related compounds and water are reported.

Preparing a specification

Specify 2-chloropyrimidine, CAS 1722-12-9, identity and assay methods, and any explicit 2-hydroxypyrimidine criterion. Include additional related compounds and water only where relevant to the receiving route, with agreed reporting thresholds.

Packaging and storage

Packaging format, closure and net weight should be agreed for the selected grade, order quantity and destination. Request the actual supplier SDS and confirm its storage and transport instructions before receipt.

Documentation

Request COA, SDS, proposed specification and a representative chromatogram. Confirm whether the supplier can demonstrate separation or quantitation of 2-hydroxypyrimidine and explain the assay basis used for the offered grade.

Procurement questions

How should 2-hydroxypyrimidine be controlled?

If it is relevant to the route, agree a separate limit and an analytical method that resolves it from 2-chloropyrimidine.

Is chromatographic area the same as assay?

They can use different reporting bases. Specify whether the requirement is an area percentage or quantitative content, including treatment of water and unknown peaks.

Is this the same as 2,4-diamino-6-chloropyrimidine?

No. That compound has two amino groups and a different substitution pattern and CAS.

Technical sources
  1. PubChem CID 74404NCBI / PubChem
  2. 2-Chloropyrimidine 193291Sigma-Aldrich
  3. 2-Chloropyrimidine C1050Tokyo Chemical Industry
  4. Biochemicals catalogue: 2-Chloropyrimidine A15394Thermo Fisher Scientific / Alfa Aesar