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The title compound, C15H16N2O5S, is a product of the reaction of 2-(2,4-dimeth­oxy­phenyl­amino)-1,3-thia­zol-4(5H)-one with acetic anhydride. The presence of the acetyl and acet­oxy groups in the mol­ecule indicates that the starting thia­zole exists as a tautomer in the reaction mixture with exocyclic amino and enol moieties. The acetyl group is tilted slightly from the heterocyclic ring plane [dihedral angle = 4.46 (11)°], while the acet­oxy group is almost perpendicular to this ring [dihedral angle = 88.14 (12)°]. An intra­molecular acet­yl–meth­oxy C—H...O inter­action is noted. In the crystal, mol­ecules are connected into a three-dimensional architecture by C—H...O inter­actions.

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The structural analysis of the title compound, C14H14N2O4S, particularly the presence of an acetyl group at the exocyclic N atom and the C(H)—C(O2CMe)—N acet­oxy group in the thia­zole ring, may indicate that one of the starting materials, i.e. 2-(4-meth­oxy­anilino)-1,3-thia­zol-4(5H)-one, exists in the reaction mixture, at least partially, as a tautomer with an exocyclic amine N atom and an enol group. The acet­oxy and acetyl groups deviate from the thia­zole plane by 69.17 (6) and 7.25 (19)°, respectively. The thia­zole and benzene rings form a dihedral angle of 73.50 (4)°. In the crystal, centrosymmetrically related mol­ecules are connected into dimeric aggregates via C—H...O inter­actions.
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