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The title compounds, C27H22ClN3, (IV), and C24H17Cl2N3O2, (V), were synthesized as part of our ongoing studies on (2+3)-cyclo­addition reactions. Compound (V) crystallizes with two mol­ecules in the asymmetric unit. The pyrazolidine ring of compound (IV) adopts a twisted conformation, while in compound (V) it adopts a twisted and an envolope conformation in the two molecules. There are short inter­molecular contacts, which can be recognized as unconventional hydrogen bonds, in both structures.
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