Bicyclo[1.1.0]butane

Also known as: Bicyclo[1,1,0]butane, Bicyclobutadiene, Bicyclobutane, bicyclo<1.1.0>butane

Bicyclo[1.1.0]butane (CAS 157-33-5) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C4H6 and a molecular weight of 54.09040 g/mol. Key properties include a boiling point of 11.6ºC at 760mmHg and a density of 1.04g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 157-33-5
Jingsj CID: J-1126767-7
Molecular Formula: C₄H₆
Molecular Weight: 54.09040 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	11.6ºC at 760mmHg
Density	1.04g/cm3
Exact Mass	54.04700
LogP	1.02620
Vapor Pressure	1220mmHg at 25°C
Refractive Index	1.547

Customs & Trade Information

HS Code	2902199090
Summary	2902199090 other cyclanes, cyclenes and cyclotherpenes。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:2.0%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Bicyclo[1.1.0]butane?

The CAS number of Bicyclo[1.1.0]butane is 157-33-5.

What are the molecular formula and molecular weight of Bicyclo[1.1.0]butane?

Bicyclo[1.1.0]butane has molecular formula C4H6 and molecular weight 54.09040 g/mol.

What are the upstream and downstream products of Bicyclo[1.1.0]butane?

For Bicyclo[1.1.0]butane, Downstream Products: 4-Bromo-1-butene, Bromocyclobutane, (Bromomethyl)cyclopropane.

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. "Bicyclo[1.1.0]butane (CAS 157-33-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1126767-7 (accessed 2026-11-09).

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