Explanatory notes
… function (–COOH), called the carboxyl group. In theory, the heading also covers the ortho-acids (RC(OH) 3 ) since these … the hydroxyl group (–OH) is removed, the residue is an acyl radical which can be represented by the formula (RCO–) where … alkyl or aryl radical (methyl, ethyl, phenyl, etc.). Acyl radicals enter into the formulae of anhydrides, halides, …