1,3-Bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazolium tetrafluoroborate
1,3-Bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazolium tetrafluoroborate (CAS: 245679-18-9), a robust organic compound with the molecular formula C21H27BF4N2, serves as a crucial precursor in organometallic chemistry. Its structure makes it an effective N-heterocyclic carbene (NHC) ligand, widely employed in catalysis for cross-coupling reactions and other organic transformations. Supplied by Tech Serve Solutions, this high-purity chemical facilitates advanced synthetic methodologies.
- IUPAC
- 4,5-Dihydro-1,3-bis(2,4,6-trimethylphenyl)-1H-imidazolium tetrafluoroborate(1-),4,5-Dihydro-1,3-dimesityl-1H-imidazolium tetrafluoroborate,4,5-Dihydro-1,3-dimesitylimidazolium tetrafluoroborate,SIMes-HBF4
- Synonyms
- C21H27BF4N24,5-Dihydro-1,3-bis(2,4,6-trimethylphenyl)-1H-imidazolium tetrafluoroborate(1-)4,5-Dihydro-1,3-dimesityl-1H-imidazolium tetrafluoroborate4,5-Dihydro-1,3-dimesitylimidazolium tetrafluoroborateSIMes-HBF4

Catalysis
This compound functions as a precursor for N-heterocyclic carbene (NHC) ligands, which are vital in homogeneous catalysis. These ligands are instrumental in facilitating a variety of organic transformations, including cross-coupling reactions.
Organometallic Chemistry
It is extensively used in the synthesis and study of organometallic complexes. The NHC ligand derived from this precursor can stabilise various metal centres, enabling novel reactivity and catalytic cycles.
Chemical Synthesis
As a building block in organic synthesis, it enables the construction of complex molecules. Its utility lies in its ability to be readily converted into active catalytic species for diverse synthetic applications.
| Molecular weight | 394.26 |
|---|---|
| Empirical formula | C21H27BF4N2 |
| Assay | 95% |
| Melting point | 290-296 °C |


Hazard statements
- H314Causes severe skin burns and eye damage
- H332Harmful if inhaled
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 1759 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 20-34 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 1,3-Bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazolium tetrafluoroborate used for?
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This compound is primarily used as a precursor for N-heterocyclic carbene (NHC) ligands, which are essential in homogeneous catalysis, particularly for cross-coupling reactions and other organic transformations. It also finds application in organometallic chemistry for the synthesis of metal complexes.
What are the CAS number and molecular formula?
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The CAS number is 245679-18-9 and the molecular formula is C21H27BF4N2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this compound with an assay of 95%. It is supplied as a research or technical grade material; TSS does not represent it as USP, EP, BP or any other pharmacopoeia grade.
How should this chemical be handled and stored?
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This compound is classified as corrosive and harmful if inhaled. Handle with extreme care, using appropriate personal protective equipment including eyeshields, face shields, gloves, and respiratory protection (type N100 US or P3 EN143). Store in a well-ventilated area away from incompatible materials.
Is this chemical shipped internationally?
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Yes, Tech Serve Solutions specialises in global export of fine chemicals and reagents, including this compound.
How can I request a sample or quote?
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Please contact our sales department via the website or phone to request a sample or a quotation for this chemical.
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