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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

1,2,3-Trimethoxybenzene | CAS 634-36-6

Three consecutive methoxy groups make this pyrogallol-derived arene a precursor for densely oxygenated aromatic chemistry, including published trimethoxybenzaldehyde routes and studies of selective oxidation to quinone or phenol derivatives.

CAS634-36-6
Molecular formulaC9H12O3
Molecular weight168.19 g/mol

Product overview

All three oxygen atoms are present as methyl ethers on adjacent ring positions. The remaining aromatic sites therefore belong to a different substitution environment from the symmetrical 1,3,5-isomer. Published routes use this arrangement in preparing 2,3,4-trimethoxybenzaldehyde, while oxidation research illustrates how the same arene can lead to different oxygenated products. Identification should establish the consecutive 1,2,3 pattern, not simply a trimethoxybenzene formula. Residual partially methylated phenols and positional isomers are useful quality-review targets when justified by the production route.

Chemical identity

Chemical name
1,2,3-Trimethoxybenzene
CAS number
634-36-6
Molecular formula
C9H12O3
Molecular weight
168.19 g/mol

Application context

The molecule supplies a preassembled trio of adjacent methoxy substituents to trimethoxybenzaldehyde chemistry. Published oxidation research has also examined its conversion to dimethoxybenzoquinone or trimethoxyphenol products, with selectivity depending on the reaction environment. Buyers developing these transformations should review aromatic identity and phenolic residues together: changes in oxygen substitution can complicate product distribution. For analytical comparison, agree a method that resolves relevant methoxylated aromatics, and set colour and water requirements only where the chosen transformation requires them.

Chemistry and synthetic role

A benzene ring bears methoxy groups at three consecutive sites; no free phenolic OH remains.

Quality review

Confirm consecutive substitution

Use NMR or another structural method distinguishing 1,2,3 from 1,3,5 substitution.

Screen partial methylation

Discuss phenolic residues associated with the selected synthesis.

Resolve oxygenated aromatics

Specify chromatographic separation of relevant related compounds.

Preparing a specification

State the 1,2,3-isomer, a structure-confirming test, chromatographic purity and selected phenolic or positional-isomer limits.

Packaging and storage

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

Documentation

Request a batch COA, SDS and the analytical methods for the acceptance criteria below. Confirm which supporting chromatograms and identity data are available from the selected manufacturer.

Procurement questions

Is 1,3,5-trimethoxybenzene interchangeable?

No; its symmetry and available ring positions differ.

Why check free phenols?

Their oxygen substitution and reaction behaviour differ from the tri-ether.

Can one purity peak establish the ring pattern?

A structural identification should accompany the assay.

Technical sources
  1. PubChem CID 12462NCBI / PubChem
  2. 1,2,3-Trimethoxybenzene T1102TCI
  3. Preparation of 2,3,4-trimethoxybenzaldehyde — CN102875344APatent publication
  4. Differing selectivities in mechanochemical versus conventional solution oxidation using OxoneTetrahedron Letters