1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene

Also known as: 1-(4-n-Butylphenyl)-2-(4-methoxyphenyl)acetylene, 1-(4-methoxyphenyl)-2-(4-n-butylphenyl)acetylene, 1-butyl-4-[2-(4-methoxyphenyl)ethynyl]benzene, 1-n-Butyl-4-[2-(4-methoxyphenyl)ethynyl]benzene, 1-n-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene, 4-Methoxy-4'-n-butyl-tolan, 4-n-Butyl-4'-methoxy-diphenylacetylene, p-Butyl-p'-methoxy-tolan, Tolane 4-O1

1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene (CAS 35684-12-9) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C19H20O and a molecular weight of 264.362 g/mol. Key properties include a melting point of 40ºC, a boiling point of 391.5±35.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 188.9±21.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 35684-12-9
Jingsj CID: J-43875-5
Molecular Formula: C₁₉H₂₀O
Molecular Weight: 264.362 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	40ºC
Boiling Point	391.5±35.0 °C at 760 mmHg
Density	1.0±0.1 g/cm3
Flash Point	188.9±21.7 °C
Exact Mass	264.151428
PSA	9.23000
LogP	6.75
Vapor Pressure	0.0±0.9 mmHg at 25°C
Refractive Index	1.574

Customs & Trade Information

HS Code	2909309090
Summary	2909309090 other aromatic ethers and their halogenated, sulphonated, nitrated or nitrosated derivatives VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:5.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene?

The CAS number of 1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene is 35684-12-9.

What are the molecular formula and molecular weight of 1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene?

1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene has molecular formula C19H20O and molecular weight 264.362 g/mol.

What are the upstream and downstream products of 1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene?

For 1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene, Upstream Products: 1-Chloro-4-methoxybenzene, 1-butyl-4-chlorobenzene, Propiolic acid.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "1-Butyl-4-[(4-methoxyphenyl)ethynyl]benzene (CAS 35684-12-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-43875-5 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.