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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

5-Methylquinoline | CAS 7661-55-4

A quinoline substrate with its methyl group on the benzene portion at C5, leaving the C2–H site available for studied metal-mediated transformations. Positional-isomer control is central to meaningful catalyst comparisons.

CAS7661-55-4
Molecular formulaC10H9N

Product overview

Methyl substitution at C5 changes the benzene portion of quinoline while retaining the nitrogen-containing ring and its C2–H position. This is a different architecture from quinaldine, where the methyl group occupies C2. 5-Methylquinoline has been examined in organometallic C–H activation and selective hydrogenation research. The value of a qualification sample depends on establishing this exact positional identity. Related methylquinolines can share the same molecular formula but behave as different substrates. Buyers should therefore agree a structural test and a chromatographic profile that addresses relevant isomers, alongside water and residual-solvent information needed for the planned catalyst evaluation.

Chemical identity

Chemical name
5-Methylquinoline
CAS number
7661-55-4
Molecular formula
C10H9N

Application context

Rhodium-promoted research has converted 5-methylquinoline into a C2-bound quinolinyl complex, providing a defined example of metal-mediated activation of its nitrogen heteroaromatic ring. It has also been included in selective hydrogenation studies using modified Raney nickel catalysts.

For either application, the methyl position is part of the substrate definition. Catalyst screening benefits from a consistent sample profile, including relevant quinoline isomers and solvents introduced with the reagent. State the intended transformation when requesting a sample so that material selection can address the analytical variables important to the comparison.

Chemistry and synthetic role

The methyl group lies at C5 on the fused benzene ring. The quinoline nitrogen and C2–H remain on the other ring, supplying the structural arrangement examined in coordination and C–H activation work.

Quality review

Locate the methyl group

Confirm C5 substitution rather than C2, C6 or another methylquinoline position.

Separate related quinolines

Agree a GC or HPLC profile for quinoline and the positional isomers pertinent to the source route.

Control catalyst-screening variables

Set water and residual-solvent criteria where these affect comparisons between catalyst systems.

Preparing a specification

Specify the 5-methylquinoline free base with structural identification and positional-isomer limits. State whether the sample is for C–H activation or hydrogenation and add appropriate solvent/water criteria.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

Is 5-methylquinoline the same as quinaldine?

No. Quinaldine is 2-methylquinoline; this product carries the methyl group at C5.

Which C–H site has been studied with rhodium?

Published work describes formation of a quinolinyl complex bonded through C2.

Why report residual solvents during catalyst screening?

They are part of the material introduced into the comparison and may need control for a consistent test system.

Technical sources
  1. 5-Methylquinoline CID 24312PubChem
  2. 5-MethylquinolineChemScene via Sigma-Aldrich
  3. Rhodium-Promoted C–H Bond Activation of Quinoline, Methylquinolines, and Related Mono-Substituted QuinolinesOrganometallics
  4. Silica Modulation of Raney Nickel Catalysts for Selective HydrogenationPrecision Chemistry