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The title compound, C22H20N6, was synthesized by the reaction of 5-amino-3-methyl-1-phenyl­pyrazole with [4-(di­methyl­amino)­benzyl­idene]­malono­nitrile in glycol under microwave irradiation. X-ray crystal structure analysis reveals that the mol­ecules exist as centrosymmetric N—H...N hydrogen-bonded dimers.

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The title compound, C17H14ClN5O, was synthesized by the reaction of malononitrile with 4-chloro­benzaldehyde and morpholine in glycol under microwave irradiation. X-ray analysis reveals that the morpholine ring is in a chair conformation. In the crystal structure, inter­molecular N—H...O, C—H...N and N—H...N hydrogen bonds form a three-dimensional network.

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The title compound, C22H20BrNO, was synthesized by the reaction of 4-bromo­benzaldehyde with p-toluidine and 5,5-dimethyl­cyclo­hexa­ne-1,3-dione in glycol under microwave irradition. The terminal saturated six-membered ring of the dihydro­acridine moiety has a twist-boat conformation. The crystal packing is mainly stabilized by van der Waals forces.
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