F 1598 (OTTO) 4-Fluoroiodobenzene, 99% Cas 352-34-1 - used in the preparation of fluorotriphenylene derivatives. F 1598 (OTTO) 4-Fluoroiodobenzene, 99% Cas 352-34-1 is a versatile building block in 18F radiochemistry and is used in various transition metal-mediated C-C and C-N cross-coupling reactions.