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Two polymorphic forms of the oxathiin systemic fungicide active carboxine
Christopher S Frampton1, Eleanor S Frampton2, Paul A Thomson3
1Experimental Techniques Centre, Brunel University London, Kingston Lane, Uxbridge UB8 3PH, England.
Abstract:
Two polymorphic crystal forms of the title compound, C12H13NO2S (systematic name: 6-methyl-N-phenyl-2,3-di-hydro-1,4-oxathiine-5-carboxamide), were isolated from a truncated, (12 solvent), polymorph screen on pure lyophillized material. Crystals of form 1 were obtained from all solvents included in the screen with the exception of methanol. As isolated from aceto-nitrile the crystals are triclinic, space group P with Z' = 2. Crystals of form 2, which were isolated from methanol only are monoclinic, space group I2/a with Z' = 1. The crystal packing in both structures is dominated by the formation of infinite -NH⋯O hydrogen-bonded chains through the carboxamide core.
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