FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on info@ossila.com, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.

4-Bromo-3-fluoroiodobenzene

CAS Number 136434-77-0

Chemistry Building Blocks, Fluorinated Building Blocks, Monomers


Product Code B3221-5g
Price $44 ex. VAT

Quality assured

Expert support

Volume discounts

Worldwide shipping

Fast and secure


A versatile multi-halogenated building block

Utilised as a synthesis intermediate for carbazole derivatives, APIs and liquid crystals


4-Bromo-3-fluoroiodobenzene (CAS number 136434-77-0), is a multi-halogenated benzene derivative with an iodide, a fluoride and a bromide at 1-, 3- and 4-positions, respectively. 4-Bromo-3-fluoroiodobenzene serves as a molecular scaffold due to its three distinct substituents. The fluoride group is favourable for nucleophilic aromatic substitution, i.e.  nucleophilic displacement of the fluorine atom with the amine derivative, creating a substituted aryl amine bond. The iodide and bromide functional groups are preferred in metal-catalysed cross-coupling reactions. Additionally, iodide exhibits higher reaction rate during the catalytic reaction compared to the bromide substituent.

Selective factor Xa inhibitors (7-fluoroindazole derivatives) are synthesised from 4-bromo-3-fluoroiodobenzene. The resulting Xa inhibitors exhibit highly selective potency of 5.2 nM.

Multiple functional groups

Multiple functional groups

For facile synthesis

Fluorinated iodobenzene building block

Fluorinated iodobenzene building block

For drug discovery, liquid crystals, and carbazole derivatives

competitively priced 136434-77-0

Low Cost

Competitively priced, high quality product

High purity 136434-77-0

High purity

>98% High purity

General Information

CAS Number 136434-77-0
Chemical Formula C6H3BrFI
Full Name 1-Bromo-2-fluoro-4-iodobenzene
Molecular Weight 300.90 g/mol
Synonyms 2-Bromo-4-fluoroiodobenzene
Classification / Family Fluorinated building blocks, Aromatic building blocks, APIs, Liquid crystals, Carbazole derivatives

Chemical Structure

4-Bromo-3-fluoroiodobenzene chemical structure, CAS 136434-77-0
4-Bromo-3-fluoroiodobenzene chemical structure, CAS 136434-77-0

Product Details

Purity 98%
Melting Point Tm = 34 °C – 38 °C
Appearance White crystals

MSDS Documentation

4-Bromo-3-fluoroiodobenzene4-Bromo-3-fluoroiodobenzene MSDS Sheet

Literature and Reviews

  1. 7-Fluoroindazoles as potent and selective inhibitors of factor Xa, Y.-K. Lee et al., J. Med. Chem., 51, 282–297 (2008); DOI: 10.1021/jm701217r.
  2. Synthetic advantages of defluorinative C-F bond functionalization, L. Hooker et al., Angew. Chem. Int. Ed., e202308880 (2023); DOI: 10.1002/anie.202308880.
  3. Copper/β-diketone-catalysed N-arylation of carbazoles, F. Chen et al., RSC Adv., 5, 51512–51523 (2015); DOI: 10.1039/C5RA07690K.
  4. Low mid-infrared absorption tolane liquid crystals terminated by 2,2-difluorovinyloxyl: synthesis, characterization and properties, M. Hu et al., J. Mater. Chem. C, 4, 4939 (2016); DOI: 10.1039/c6tc01249c.
  5. Antitubercular nitrofuran isoxazolines with improved pharmacokinetic properties, Rakesh et al., Bioorg. Med. Chem., 20 (20), 6063–6072 (2012); DOI: 10.1016/j.bmc.2012.08.023.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

Return to the top