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In the structure of N-but­yl-N-o-tolylbenzene­sulfonamide, C17H21NO2S, the mean planes of the benzene rings are inclined to each other at 40.3 (1)°. The geometry around the S atom is considerably distorted from ideal tetra­hedral geometry. Centrosymmetrically related pairs of mol­ecules dimerize through C—H...O hydrogen bonds. The crystal packing is stabilized by inter­molecular C—H...O hydrogen bonding.

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In the title compound, C30H25NO3S, the phenyl­sulfon­yl and methoxy­phen­yl groups are almost perpendicular to the indole unit, whereas the other phen­yl ring is inclined at an angle of 68.9 (1)° to it. The benzene ring of the phenyl­sulfon­yl substituent makes a dihedral angle of 68.0 (1)° with the benzene ring of the methoxy­phen­yl substituent. The mol­ecular packing in the crystal is stabilized by weak intra- and inter­molecular C—H...O inter­actions.

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In the title compound, C30H24ClNO3S, the phenyl­sulfon­yl, chloro­phen­yl and methoxy­phen­yl rings are each almost perpendicular to the indole ring system. The crystal packing shows centrosymmetrically related pairs of mol­ecules. Inter­molecular C—H...O inter­actions are present.
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