Does CAS 140-66-9 identify a single 4-tert-Octylphenol isomer?

CAS 140-66-9 is used for 4-(1,1,3,3-tetramethylbutyl)phenol, commonly called 4-tert-Octylphenol or p-tert-Octylphenol. A generic octylphenol or octylphenol-isomer mixture is not automatically equivalent. Confirm the para-substituted structure, CAS number and chromatographic identity before substitution.

Which quality controls matter when buying 4-tert-Octylphenol?

Agree GC assay, isomer distribution, residual phenol and alkylation by-products, color, water, ash and melting or solidification range where applicable. Also specify the supplied form and flake or particle requirements, since these affect sampling, melting and charging. Review actual batch results and test methods in the COA.

What regulatory information should accompany a 4-tert-Octylphenol offer?

State the intended industrial use and destination before approval. Request the current SDS, TDS and applicable inventory, restriction or authorization statements for the destination market, including any supply-chain communication required for octylphenol substances. Regulatory acceptance should be assessed for the specific use, grade and jurisdiction rather than inferred from the CAS number alone.

4-tert-Octylphenol (p-tert-Octylphenol) CAS 140-66-9

4-tert-Octylphenol (p-tert-Octylphenol), CAS 140-66-9, is also known as 4-(1,1,3,3-tetramethylbutyl)phenol. It is an alkylphenol used in phenolic-resin chemistry and the preparation of selected surfactant intermediates. For procurement review, confirm the required isomer identity, intended downstream chemistry, offered form, and relevant specification limits, packaging, and applicable safety documentation.

CAS: 140-66-9
Synonyms: 4-tert-Octylphenol; p-tert-Octylphenol; 4-(1,1,3,3-Tetramethylbutyl)phenol
Einecs: 205-426-2
Molecular Formula: C₁₄H₂₂O
Grade: Confirm current product specification
Package: Confirm packaging for the offered form

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Product Description

Product name: 4-tert-Octylphenol (p-tert-Octylphenol)

CAS number: 140-66-9

Molecular formula: C₁₄H₂₂O

Molecular weight: 206.33 g/mol

EC number: 205-426-2

Other names: 4-tert-Octylphenol; p-tert-Octylphenol; 4-(1,1,3,3-Tetramethylbutyl)phenol

Chemical class: an alkylphenol

Identity check: CAS 140-66-9 identifies the exact 4-tert (para) isomer, not a generic octylphenol or an unspecified mixed-isomer material.

Technical context: phenolic-resin chemistry and the preparation of selected surfactant intermediates

RFQ information: Before an RFQ, confirm the required isomer identity, intended downstream chemistry, offered form, and relevant specification limits.

Offered form: Not specified; confirm the actual offered form.

Specification review: Confirm identity, relevant assay or impurity criteria, and suitability in the current technical dossier.

Safety: Follow the current SDS for the exact offered form and the receiving site’s controls.

FAQ - Technical & Supply Chain

Q:
Does CAS 140-66-9 identify a single 4-tert-Octylphenol isomer?

A: CAS 140-66-9 is used for 4-(1,1,3,3-tetramethylbutyl)phenol, commonly called 4-tert-Octylphenol or p-tert-Octylphenol. A generic octylphenol or octylphenol-isomer mixture is not automatically equivalent. Confirm the para-substituted structure, CAS number and chromatographic identity before substitution.
Q:
Which quality controls matter when buying 4-tert-Octylphenol?

A: Agree GC assay, isomer distribution, residual phenol and alkylation by-products, color, water, ash and melting or solidification range where applicable. Also specify the supplied form and flake or particle requirements, since these affect sampling, melting and charging. Review actual batch results and test methods in the COA.
Q:
What regulatory information should accompany a 4-tert-Octylphenol offer?

A: State the intended industrial use and destination before approval. Request the current SDS, TDS and applicable inventory, restriction or authorization statements for the destination market, including any supply-chain communication required for octylphenol substances. Regulatory acceptance should be assessed for the specific use, grade and jurisdiction rather than inferred from the CAS number alone.

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