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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

2-Isopropylaniline (o-cumidine) | CAS 643-28-7

An ortho-substituted primary aniline reported in phosphorus-ligand and pyrrole-imine precursor research, where ring-substitution identity, free-amine content and the material’s air-exposure history matter more than a generic intermediate label.

CAS643-28-7
Molecular formulaC9H13N
Molecular weight135.21 g/mol

Product overview

Placing an isopropyl group next to the amino group makes o-cumidine structurally different from both para-isopropylaniline and N-isopropylaniline. The latter name places the substituent on nitrogen rather than on the ring and must not be treated as an alias. CAS 643-28-7 retains a primary aromatic amino group and is documented as a starting component for several ligand families. Its relevance in those studies is the defined ortho-substituted aryl group introduced around a nitrogen-containing framework. Published supplier information also identifies air sensitivity. Buyers should therefore review regioisomer identity, quantitative amine content and handling history, and specify water only to the level required by the intended subsequent chemistry.

Chemical identity

Chemical name
2-Isopropylaniline
CAS number
643-28-7
Molecular formula
C9H13N
Molecular weight
135.21 g/mol

Application context

Ligand research uses 2-isopropylaniline to prepare an N,N-bis(diphenylphosphino)aniline framework studied with palladium and platinum, and a separate pyrrole-imine pro-ligand. Both require the defined ortho-substituted aryl group. Request structural evidence distinguishing ortho from para and N-isopropyl alternatives, and agree free-amine assay rather than relying on chromatographic area alone. Set water criteria for the particular ligand-forming reaction.

Chemistry and synthetic role

The NH2 function supports imine formation or nitrogen functionalization in the cited research. The adjacent isopropyl group is ring-bound and remains a feature of the resulting aryl fragment.

Quality review

Distinguish ring and nitrogen substitution

Check o-cumidine against para and N-isopropyl alternatives by an appropriate structural method.

Compare GC with amine assay

Chromatographic area and titratable free-amine content are different measurements; agree which determines charge calculations.

Review air exposure and colour

TCI identifies air sensitivity. Agree any colour criterion and handling record needed for the intended chemistry.

Preparing a specification

Specify 2-isopropylaniline, CAS 643-28-7, as the primary ortho-substituted amine; define assay, positional-isomer criteria and water requirements for the receiving ligand synthesis. Agree appearance or colour limits only when functionally relevant.

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

Is N-isopropylaniline an alternative name?

No. It places isopropyl on nitrogen and describes a different compound.

Is this a palladium catalyst?

No. The research uses it to construct ligands that are subsequently complexed.

Should water always meet an ultra-low limit?

Only if the receiving chemistry requires it; no universal limit follows from the CAS.

Technical sources
  1. PubChem CID 12561 — identity property recordNCBI / PubChem
  2. 2-Isopropylaniline I0318Tokyo Chemical Industry
  3. Synthesis and characterization of new bis(diphenylphosphino)aniline ligands and their complexesPolyhedron / Elsevier
  4. Synthesis and reactivity of Rh(I) and Ir(I) complexes — section 7.10.2University of Sheffield / Dean Cocker