KC6H5BF3

KC6H5BF3 refers to potassium pentafluorophenyltrifluoroborate. It is an organoboron compound with the chemical formula C6H5BF3K. This salt is a derivative of phenylboronic acid where the boron atom is bonded to three fluorine atoms and a phenyl group, and the entire complex is paired with a potassium cation.

The compound is known for its utility in organic synthesis, particularly in cross-coupling reactions. It serves as a convenient and stable source of the phenyl group, which can be transferred to other molecules through palladium-catalyzed reactions such as the Suzuki-Miyaura coupling. Unlike some other organometallic reagents, KC6H5BF3 is often described as being relatively stable to air and moisture, making it easier to handle and store.

Its preparation typically involves the reaction of phenylmagnesium bromide with boron trifluoride etherate, followed by treatment with potassium fluoride. The resulting compound is a crystalline solid. The unique structure, with the boron atom part of a BF3K- moiety, contributes to its reactivity and stability profile. KC6H5BF3 is employed in the synthesis of various complex organic molecules, including pharmaceuticals and materials.