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Description
TCI D3701 (CAS 347838-12-4), 3,4-Difluoro-2,5-bis(trimethylsilyl)thiophene, is a fluorinated thiophene compound carrying two fluorine atoms at the 3- and 4-positions of the ring and two trimethylsilyl groups at the 2- and 5-positions. In the laboratory, this compound serves as a specialised fluorinated building block for the synthesis of functional organic materials, particularly organic semiconductors, conjugated polymers, and small molecules intended for electronic devices. The presence of silyl groups at both ends of the ring makes it a protected, activation-ready precursor, allowing researchers to direct subsequent reactions precisely at the alpha positions of the thiophene ring.
The characteristics that lead researchers to select this material lie in the combination of the electronic effect of fluorine and the dual function of the trimethylsilyl groups. The fluorine atoms lower the orbital energy levels of the ring, thereby increasing electron-accepting character and improving the oxidative stability of the resulting material — an important consideration in the design of both n-type materials and donor–acceptor copolymers. The trimethylsilyl groups act simultaneously as protecting groups and as directing groups: they keep the alpha positions free from unwanted reactions and can be replaced selectively through desilylation reactions, giving synthetic chemists controlled access to those positions when the sequence calls for it.
In Indonesian laboratories, this building block is typically used within university and institutional research groups working on organic electronics and polymer materials, as well as in synthetic chemistry laboratories developing fluorinated heterocyclic intermediates. It is generally handled at the bench scale in multi-step synthesis routes, where a well-defined and regiochemically protected thiophene core shortens the path to a target monomer or small molecule. Because it is a specialised research chemical rather than a routine reagent, it is normally ordered per project and stored under controlled conditions between synthesis campaigns.
Laboratory Applications
- Organic semiconductor synthesis — the fluorinated, silyl-capped thiophene core provides a low-lying orbital building block suited to charge-transport materials for electronic device research.
- Conjugated polymer preparation — the protected alpha positions allow controlled activation and coupling, giving researchers regiochemical certainty when building thiophene-containing polymer backbones.
- Donor–acceptor copolymer design — fluorine substitution at the 3- and 4-positions strengthens electron-accepting character, making the compound useful for tuning donor–acceptor electronic structures.
- n-Type material development — the reduced orbital energy levels imparted by the two fluorine atoms support the design of electron-transporting organic materials in device-oriented studies.
- Small-molecule electronic material synthesis — as a bifunctional protected precursor, it enables stepwise construction of well-defined small molecules for organic electronic device fabrication.
Specifications
- Brand: TCI (Tokyo Chemical Industry)
- CAS number: 347838-12-4
- Chemical name: 3,4-Difluoro-2,5-bis(trimethylsilyl)thiophene
- Catalogue reference: D3701
- Category: Chemistry > Building Blocks > Fluorinated Building Blocks
- Pack sizes: available in standard TCI research-scale packaging; please confirm the pack size options when ordering
- Storage: keep in the manufacturer's original container under the conditions stated on the product label and Safety Data Sheet
Handling and Storage
Store the compound in its original, tightly closed manufacturer container, kept in a cool, dry, and well-ventilated chemical store away from heat sources, ignition sources, and direct sunlight. As an organosilicon building block, it is best kept sealed and protected from moisture and air to preserve the integrity of the trimethylsilyl groups; inert-atmosphere storage and handling are advisable where the intended synthesis demands it. Handle inside a fume hood using safety glasses, chemical-resistant gloves, and a laboratory coat, and avoid inhalation of vapours or contact with skin and eyes. Keep the container clearly labelled, transfer with clean and dry glassware, and dispose of residues and contaminated materials as chemical waste in accordance with institutional procedures. Always consult the manufacturer's Safety Data Sheet before use.
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