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Crystal structures of two (Z)-2-(4-oxo-1,3-thiazolidin-2-ylidene) acetamides
The crystal structures of two (oxothiazolidin-2-ylidene) acetamides, namely (Z)-2-[2-(morpholin-4-yl)-2-oxoethylidene] thiazolidin-4-one, C9H12N2O3S, (I), and (Z)-N-(4-methoxyphenyl)-2-(4-oxothiazolidin-2-ylidene) acetamide, C12H12N2O3S, (II), are described and compared with a related structure. The Z conformation was observed for both the compounds. In (I), the morpholin-4-yl ring has a chair conformation and its mean plane is inclined to the thiazolidine ring mean plane by 37.12 (12)degrees. In (II), the benzene ring is inclined to the mean plane of the thiazolidine ring by 20.34 (14) degrees. In the crystal of (I), molecules are linked by N-H center dot center dot center dot O hydrogen bonds, forming C(6) chains along the b-axis direction. The edge-to-edge arrangement of the molecules results in short C-H center dot center dot center dot O and C-H center dot center dot center dot S interactions, which consolidate the chain into a ribbon-like structure. In the crystal of (II), two N-H center dot center dot center dot O hydrogen bonds result in the formation of C(8) chains along the b-axis direction and C(6) chains along the c-axis direction. The combination of these interactions leads to the formation of layers parallel to the bc plane, enclosing R-4(4) (28) rings involving four molecules.
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Reference:
Thiazolidine – Wikipedia,
,Thiazolidine – ScienceDirect.com