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Carboxamidines: Amidines or carboxamidines are a class of oxoacid derivatives having the functional group -C(=NH)-NH2, where oxo acid is carboxylic acid. Some of the well-known carboxamidines are DBU, and benzamidine. In general, amidines are much more basic than amides. Amidinate salts are widely used as ligands in organometallic complexes. DBU is widely used in organic synthesis as a catalyst, a complexing ligand, and a non-nucleophilic base. In pharmaceuticals, amidines are extensively used, for instance as antibacterials.
Imides: Imides are a class of organic compounds that contain two acyl groups attached to nitrogen. Structurally related to anhydrides, most of the imides are cyclic compounds derived from dicarboxylic acids. They find extensive use in organic synthesis. N-bromo and N-chloro succinimides are halogenating agents. Phthalimides are used in the synthesis of primary amines. Some of the high strength or electrically conductive polymers contain imide subunits. A number of imides are known for their fungicidal and herbicidal activity.
Hydroxaminc acid and its derivatives: Hydroxamic acids is the class of organic compounds bearing the functional group -C(=O)-NHOH. They are often used in as metal chelators in chemistry and metallurgy. A variation of the Lossen rearrangement involves the use of hydroxamic acid derivatives. A derivative of hydroxamic acid, Weinreb amide, is extensively used in ketone synthesis. In the field of pharmaceuticals, hydroxamic acid finds use as histone deacteylase inhibitors (HDAC) and as other zinc binding compounds.