Naming Aromatic Compounds Arenes Alkyl-substituted benzenes Named depending on the size of the alkyl group Alkyl substituent smaller than the ring(6 or fewer carbons),named as an alkyl substituted benzene Alkyl substituent larger than the ring(7 or more carbons),named as a phenyl-substituted alkane Phenyl Derived from the Greek pheno("I bear light") Michael Faraday discovered benzene in 1825 from the oily residue left by illuminating gas used in London street lamps Used for the-CeH5 unit when the benzene ring is considered as a substituent Abbreviated as Ph or (Greek phi) Benzyl Used for the C6H5CH2-group Arenes ▪ Alkyl-substituted benzenes ▪ Named depending on the size of the alkyl group ▪ Alkyl substituent smaller than the ring (6 or fewer carbons), named as an alkyl substituted benzene ▪ Alkyl substituent larger than the ring (7 or more carbons), named as a phenyl-substituted alkane Phenyl ▪ Derived from the Greek pheno (“I bear light”) ▪ Michael Faraday discovered benzene in 1825 from the oily residue left by illuminating gas used in London street lamps ▪ Used for the –C6H5 unit when the benzene ring is considered as a substituent ▪ Abbreviated as Ph or F (Greek phi) Benzyl ▪ Used for the C6H5CH2– group Naming Aromatic Compounds