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CAS Number 124638-53-5

Chemistry Building Blocks, Heterocyclic Building Blocks, Materials, Monomers

Product Code B1091-1g
Price £100 ex. VAT


With functionalities spreading over the fused thienothiophene ring, this intermediate is widely used for the synthesis of supramolecules, semiconducting molecules, oligomers and conjugated polymers.

Specifications | MSDS | Literature and Reviews

2,3,5,6-Tetrabromothieno[3,2-b]thiophene, CAS number 124638-53-5, is an all brominated thieno[3,2-b]thiophene derivative. 2,3,5,6-tetrabromothieno[3,2-b]thiophene is an intermediate with full functionality around the fused rings to extend its conjugation to more complex structures such as conjugated polymers, supramolecules, ladder type polythienothiophenes for OFETs and OPV applications. 2,3,5,6-Tetrabromothieno[3,2-b]thiophene can be synthesised by full bromination of thienothiophene by using bromine as the oxidising agent in acetic acid and chloroform. Large scale synthesis can be achieved by bromination of thieno[3,2-b]thiophene-2-carboxylic acid with bromine in water and acetic acid.

The synthesis of 2,3,5,6-Tetrabromothieno[3,2-b]thiophene
The synthesis of 2,3,5,6-Tetrabromothieno[3,2-b]thiophene

2,3,5,6-Tetrabromothieno[3,2-b]thiophene can be selectively reduced to 3,6-dibromothieno[3,2-b]thiophene by using zinc in acetic acid. Further function at 3.6-positions can give ladder type poly(thienothiophenes) to extend conjugations to the fused thiophene rings. Electropolymerization of 3,6-dimethoxy-thieno[3,2-b]thiophen leads to a conjugated polymer with similar electronic and physical properties, i.e., redox potential, bandgap, optical transparency and stability to PEDOT.

General Information

CAS Number 124638-53-5
Chemical Formula C6Br4S2
Full Name 2,3,5,6-Tetrabromothieno[3,2-b]thiophene
Molecular Weight 455.80 g/mol
Synonyms Perbromothieno[3,2-b]thiophene, tetrabromo-thieno[3,2-b]thiophene
Classification / Family Thienothiophene, semiconductor synthesis intermediates, low band gap polymers, OLED, OFETs, organic photovoltaics

Chemical Structure

3,6-Dibromothieno[3,2-b]thiophene (TT36) chemical structure, CAS 124638-53-5
2,3,5,6-Tetrabromothieno[3,2-b]thiophene chemical structure, CAS 124638-53-5

Product Details

Purity >98% (HPLC)
Melting Point 234.0 °C
Appearance White powder/crystals

MSDS Documentation

2,3,5,6-tetrabromothieno[3,2-b]thiophene MSDS2,3,5,6-Tetrabromothieno[3,2-b]thiophene MSDS Sheet

Literature and Reviews

  1. Thienothiophenes. Part 2.1 Synthesis, metallation and bromine→lithium exchange reactions of thieno[3,2-b]thiophene and its polybromo derivatives, L. Fuller et al., J. Chem. Soc., Perkin Trans. 1, 3465-3470 (1997); DOI: 10.1039/A701877K.
  2. Poly(3,6-dimethoxy-thieno[3,2-b]thiophene): a possible alternative to poly(3,4-ethylenedioxythiophene) (PEDOT), M. Turbiez et al., Chem. Commun., 1161-1163 (2005); DOI: 10.1039/B414822C.
  3. High-performance organic field-effect transistors based on single-crystalline microribbons of a two-dimensional fused heteroarene semiconductor, Y. Wang et al., Chem. Commun., 51, 11961-11963 (2015); 10.1039/C5CC03305E.
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