C6H4I

C6H4I refers to an iodinated benzene ring with the molecular formula C6H4I. This formula indicates a structure consisting of a benzene ring (C6H4) with one iodine atom (I) attached. The benzene ring is a planar, hexagonal structure of six carbon atoms with alternating double bonds. The C6H4 designation specifically means that two hydrogen atoms have been replaced on the benzene ring, and in this case, one of those replacements is an iodine atom, with one remaining hydrogen atom on the ring as well. The actual position of the iodine atom relative to any other substituent on the ring is not specified by this formula alone, leading to potential isomers.

Compounds with the formula C6H4I are known as iodobenzene derivatives. The iodine atom is a halogen and its presence influences the chemical properties of the benzene ring. It can participate in various chemical reactions, including nucleophilic aromatic substitution under certain conditions and palladium-catalyzed cross-coupling reactions like Suzuki or Sonogashira couplings, where the carbon-iodine bond is reactive. These reactions are important in organic synthesis for forming new carbon-carbon bonds and creating more complex molecules. The physical properties, such as melting point, boiling point, and solubility, will vary depending on the specific isomer.