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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

2,5-Dimethylphenol | CAS 95-87-4

A defined xylenol isomer with one methyl ortho and one meta to the phenolic hydroxyl, suited to synthesis requiring this specific aromatic substitution pattern and isomer-resolved raw-material control.

CAS95-87-4
Molecular formulaC8H10O
Molecular weight122.16 g/mol

Product overview

Two methyl groups distinguish this phenol from cresols, but their positions are equally important: the required material is the 2,5-isomer. Its free OH provides a phenolic reaction site while the ring carries a preselected carbon substitution pattern. The synonym p-xylenol describes the relationship between the methyl groups, not a para relationship between each methyl and the hydroxyl. For qualification, use structural identification and a chromatographic method resolving the relevant xylenols. A melting-range observation may support batch comparison but should accompany the compositional data.

Chemical identity

Chemical name
2,5-Dimethylphenol
CAS number
95-87-4
Molecular formula
C8H10O
Molecular weight
122.16 g/mol

Application context

Synthesis work uses 2,5-dimethylphenol when the target structure requires a 2,5-dimethylphenoxy or corresponding substituted phenolic fragment. The practical value lies in carrying a known substitution pattern into the next transformation. Other xylenols have the same molecular formula and can be difficult to distinguish by elemental composition alone. Agree the isomer panel with the technical team and check that the reporting limit covers its needs. Colour and melting behaviour may be included for material consistency; neither replaces a selective identity test.

Chemistry and synthetic role

A free phenolic OH bears methyl substituents at C2 and C5; the molecule is one of six dimethylphenol positional isomers.

Quality review

Resolve the xylenol panel

Select GC conditions that distinguish the relevant dimethylphenol isomers.

Interpret melting behaviour

Specify the method and range if thermal behaviour forms part of acceptance.

Track colour consistently

Define sample preparation and a reproducible colour comparison.

Preparing a specification

Name the 2,5-isomer and CAS, state GC assay and resolution requirements, and identify any required colour or melting-range tests.

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

Does the formula identify 2,5-xylenol?

No. The other xylenols share its elemental formula.

Can melting range establish purity alone?

Use it alongside chromatographic composition and structural identification.

What does p-xylenol mean?

The two methyl groups are para to each other; the preferred numbered name avoids ambiguity.

Technical sources
  1. PubChem CID 7267NCBI / PubChem
  2. Phenol, 2,5-dimethyl-NIST Chemistry WebBook
  3. 2,5-Dimethylphenol for synthesisMerck
  4. 2,5-Dimethylphenol D0775TCI