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A set of four new cyclic amidines has been synthesized and characterized. A novel intramolecular noncovalent force between carbon atoms of the aromatic ring and heteroatoms of cyclic amidines has been demonstrated and established by X-ray structural analysis and ab initio calculation at B3LYP/6-31G* level. This new noncovalent force is presumably caused by an orbitalic overlap between the σ *...
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