Potassium 5-cyanothiophene-2-trifluoroborate

Description

Potassium 5-cyanothiophene-2-trifluoroborate is a potassium organotrifluoroborate – the tetracoordinate, air-stable counterpart of the corresponding boronic acid, built on a thiophene core.

The practical argument for a trifluoroborate is stoichiometric honesty. Boronic acids equilibrate with their cyclic anhydrides (boroxines) and carry variable water, so a weighed sample is of uncertain composition. The trifluoroborate is a defined crystalline salt: it weighs what it is, tolerates air and moisture on the bench, and releases the active boron species only under the hydrolytic conditions of the reaction itself.

Key data

• Molecular formula: C5H2BF3KNS
• Molecular weight: 215.05 g/mol
• Category: Potassium Trifluoroborates

What the substitution pattern does

Thiophene is not simply a benzene ring with a sulphur atom. The ring is smaller, its internal angles differ, and sulphur contributes greater polarisability than any second-row substituent – so replacing a phenyl with a thienyl bends the molecular axis slightly while increasing refractive index.

Typical applications

• preparation of fluorinated biphenyls for display-grade liquid crystal blends
• Suzuki-Miyaura coupling where a weighable, non-hygroscopic boron source is required
• multi-step sequences in which the boron handle must survive earlier steps untouched
• reactions run in air, on the open bench, without glovebox handling
• automated and parallel synthesis, where accurate solid dispensing matters

Ordering

This compound is supplied to order. Pricing depends on quantity and on the specification you need, so it is quoted rather than listed – send an enquiry stating the quantity and any purity or analytical requirement, and you will receive a written quotation.

Handling and documentation

Supplied for laboratory and industrial use by trained personnel only. Not for use as a medicine, food, cosmetic or biocide, and not for administration to humans or animals. Safety documentation is issued with the order; this page is not a source of hazard information.