4-[18F] Fluoroiodobenzene is a versatile building block in 18F radiochemistry and is used in various transition metal-mediated C-C and C-N cross-coupling reactions. Cross-coupling reaction of 4-fluoroiodobenzene with potassium pentafluorophenyltrifluoroborate in the presence of different palladium catalysts and silver oxide in toluene has been investigated.