Synthesis and properties of seven- to nine-membered ring nitrogen heterocycles. Cyclic amidines and cyclic amidinium salts.

Medium-sized ring nitrogen heterocycles are an important class of compound which occurs in a range of natural and synthetic products. This review summarizes the current methods for the synthesis and chemical properties of cyclic amidines and cyclic amidinium salts of medium-sized rings (n= 2-4) with a fully saturated backbone. [ABSTRACT FROM AUTHOR]