Skip to product details

Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Pyridine-3-sulfonyl chloride | CAS 16133-25-8

The 3-pyridyl sulfonyl group is introduced with this reagent in published vonoprazan chemistry. Reactive sulfonyl-chloride content, hydrolysed acid and precise chemical form are more useful qualification questions than a generic intermediate purity claim.

CAS16133-25-8
Molecular formulaC5H4ClNO2S
Molecular weight177.61 g/mol

Product overview

Sulfonyl chloride at the third position of a pyridine ring defines CAS 16133-25-8. The ring nitrogen and the sulfur-based electrophilic group have different chemical roles, so neither the pyridine name nor a chloride result alone establishes the requested material. A published vonoprazan fumarate route uses this compound for sulfonylation of a separate intermediate. Its formula C5H4ClNO2S describes the named neutral form without an additional hydrochloride counterion. For a purchasing enquiry, clarify that exact form and the active sulfonyl-chloride assay. Qualification should also consider the corresponding sulfonic acid as a structurally relevant hydrolysis product and ensure that the chosen analytical method does not obscure the original material composition.

Chemical identity

Chemical name
Pyridine-3-sulfonyl chloride
CAS number
16133-25-8
Molecular formula
C5H4ClNO2S
Molecular weight
177.61 g/mol

Application context

Vonoprazan intermediate synthesis uses this reagent to install the pyridin-3-ylsulfonyl fragment. The active sulfonyl chloride must be distinguished from the corresponding sulfonic acid when evaluating content and sampling conditions. Specify C3 substitution and the neutral composition C5H4ClNO2S. If an additional hydrochloride or formulation is proposed, agree its composition and stoichiometric basis before comparing offers.

Chemistry and synthetic role

The sulfur centre transfers the 3-pyridylsulfonyl unit in the cited reaction. Pyridine-2- or pyridine-4-sulfonyl chlorides are positional alternatives, and an added hydrochloride changes the supplied composition; neither distinction should be hidden by a short code.

Quality review

Confirm pyridine position and form

Verify C3 substitution and whether the offer is the named free form or an additional salt/formulation.

Measure active sulfonyl chloride

Agree a method that distinguishes reactive material from the corresponding sulfonic acid and other relevant sulfur-containing species.

Align moisture and sample handling

Review container closure, sampling and assay preparation in relation to sulfonyl-chloride hydrolysis; agree any water criterion rather than assuming one.

Preparing a specification

Include CAS 16133-25-8, pyridine-3 substitution, neutral-form composition and active assay method. Define hydrolysed-acid control and sampling conditions for the receiving process.

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 analytical methods and batch evidence relevant to the intended process. Confirm availability of reactive-assay methodology and evidence distinguishing the acid or any proposed additional salt form.

Procurement questions

Is this a hydrochloride salt?

The specified form is pyridine-3-sulfonyl chloride, C5H4ClNO2S, without an additional HCl unit. State any proposed salt or formulation separately.

Why is a total chloride result insufficient?

It does not by itself establish the intact sulfonyl chloride or the aromatic substitution position.

Which downstream fragment does it supply?

The pyridin-3-ylsulfonyl group used in the vonoprazan synthesis route.

Technical sources
  1. PubChem CID 3164136: identity properties and CAS synonymsNCBI / PubChem
  2. Pyridine-3-sulfonyl chlorideJubilant Ingrevia
  3. Pyridine-3-sulfonyl chloride, HY-32876ChemExpress
  4. CN108191829B: Preparation of vonoprazan fumarate using intermediate IVCNIPA via Google Patents