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In the title compound, C18H18F2N2O3S, the piperazine ring adopts a chair conformation. The dihedral angle between the sulfonyl-bound benzene ring and the best fit plane throught the six non-H atoms of the piperazine ring is 69.4 (2)°, while those between the fluoro­benzene and sulfonyl rings and the fluoro­benzene and piperazine rings are 30.97 (2) and 75.98 (2)°, respectively. In the crystal, mol­ecules are connected to form a tetra­meric unit through C—H...O hydrogen bonds. The structure is further stabilized by weak inter­molecular C—H...F inter­actions, generating C(8) and C(7) chains running along [100].

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The title compound, C10H16N4, crystalizes with two mol­ecules (A and B) in the asymmetric unit in which the dihedral angles between the piperidine and pyrimidine rings are 47.5 (1) and 10.3 (1)°. The four C atoms of the pyrimidine ring in one of the mol­ecules are disordered over two sets of sites with occupancy factors 0.508 (11):0.492 (11). In the crystal, the A mol­ecules are linked to one another through N—H...N hydrogen bonds, generating R22(8) ring patterns and forming inversion dimers. These dimers are further connected on either side to a B molecule through pairs of N—H...N hydrogen bonds, resulting in a tetra­meric unit.

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In the crystal structure of the title compound, C19H21F3N2O2S, the piperazine ring adopts a chair conformation. The dihedral angles between the mean plane of the piperazine ring and the tosyl and trifluoro­methyl­phenyl rings are 74.52 (3) and 68.30 (2)°, respectively. The sulfonamide N atom deviates from the plane defined by the three attached atoms by 0.327 (1) Å. The crystal structure is stabilized by weak C—H...π inter­actions.
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