9,9'-Bi(9-borabicyclo[3.3.1]nonane)

Also known as: 9-BBN dimer, 9-BBN DIMER, 9-BBN crystalline dimer, Bis-9-borabicyclo[3.3.1]nonane, 9,9'-Bi-9-borabicyclo[3.3.1]nonane, 9-BBN dimer (crystalline), 9-Borabicyclo[3.3.1]nonane dimer

9,9'-Bi(9-borabicyclo[3.3.1]nonane) (CAS 21205-91-4) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C16H28B2 and a molecular weight of 242.016 g/mol. Key properties include a melting point of 150-152ºC, a boiling point of 343.9±25.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of 161.8±23.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 21205-91-4
Jingsj CID: J-29900-3
Molecular Formula: C₁₆H₂₈B₂
Molecular Weight: 242.016 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	150-152ºC
Boiling Point	343.9±25.0 °C at 760 mmHg
Density	0.9±0.1 g/cm3
Flash Point	161.8±23.2 °C
Exact Mass	242.237717
LogP	5.27080
Vapor Pressure	0.0±0.7 mmHg at 25°C
Refractive Index	1.480
Storage Conditions	2-8℃
Additional Property	Soluble in tetrahydrofuran, ether, hexane, benzene, toluene, carbon tetrachloride, chloroform, dichloromethane and dimethylsulfide. Slightly soluble in cyclohexane, dimethoxyethane, diglyme and dioxane.

Frequently Asked Questions

What is the CAS number of 9,9'-Bi(9-borabicyclo[3.3.1]nonane)?

The CAS number of 9,9'-Bi(9-borabicyclo[3.3.1]nonane) is 21205-91-4.

What are the molecular formula and molecular weight of 9,9'-Bi(9-borabicyclo[3.3.1]nonane)?

9,9'-Bi(9-borabicyclo[3.3.1]nonane) has molecular formula C16H28B2 and molecular weight 242.016 g/mol.

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. "9,9'-Bi(9-borabicyclo[3.3.1]nonane) (CAS 21205-91-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-29900-3 (accessed 2026-11-09).

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