2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

Also known as: 1-Cyclopentenylboronic acid pinacol ester, 1-Cyclopenteneboronic acid pinacol ester, Cyclopenten-1-ylboronic acid, pinacol ester, 2-Cyclopentenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, 2-(1-Cyclopenten-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, 1-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)cyclopentene

2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 287944-10-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C11H19BO2 and a molecular weight of 194.078 g/mol. Key properties include a boiling point of 210.1±33.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 80.8±25.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 287944-10-9
Jingsj CID: J-1518069-5
Molecular Formula: C₁₁H₁₉BO₂
Molecular Weight: 194.078 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	210.1±33.0 °C at 760 mmHg
Density	1.0±0.1 g/cm3
Flash Point	80.8±25.4 °C
Exact Mass	194.147812
PSA	18.46000
LogP	2.72810
Vapor Pressure	0.3±0.4 mmHg at 25°C
Refractive Index	1.463

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane?

The CAS number of 2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane is 287944-10-9.

What are the molecular formula and molecular weight of 2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane?

2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane has molecular formula C11H19BO2 and molecular weight 194.078 g/mol.

What are the upstream and downstream products of 2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane?

For 2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, Upstream Products: 1-Chloro-1-cyclopentene, Bis(pinacolato)diboron, 2-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.

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. "2-(Cyclopent-1-en-1-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (CAS 287944-10-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1518069-5 (accessed 2026-11-09).

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