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Multinuclear magnetic resonance spectroscopy allowed us to characterize four 1(2),5,6,7-tetrahydro-4H-indazol-4-one derivatives (1–4) and establish the most stable tautomer in each case. The crystal structure of 6,6-dimethyl-1(2),5,6,7-tetrahydro-4H-indazol-4-one (2) (orthorhombic space group P2(1)2(1)2(1), a=10.1243(8), b=21.526(2), c=24.992(2)Å, Z=4, 293K) presents two different trimers, bonded...
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