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Crystal structure of methyl (Z)-2-[(Z)-3-methyl-2-({(E)-1-[(R ?)-4-methylcyclohex-3-en-1-yl]ethylidene}hydrazinylidene)-4-oxothiazolidin-5-ylidene]acetate
The new title 4-thiazolidinone derivative, C 16 H 21 N 3 O 3 S, was obtained from the cyclization reaction of 4-methyl-3-thiosemicarbazone and dimethyl acetylenedicarboxylate (DMAD). The cyclohexylidene ring has an envelope conformation with the stereogenic centre C atom as the flap. Its mean plane makes a dihedral angle of 56.23(9) with the thiazolidine ring mean plane. In the crystal, molecules are linked by C – H?O hydrogen bonds forming chains propagating in the [001] direction. Within the chains there are offset pi-pi interactions between the thiazolidine rings of inversion-related molecules [centroid-centroid distance = 3.703(1)A]. The chains are linked by further C – H?O hydrogen bonds, forming slabs parallel to the ac plane.
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Quinuclidine – Wikipedia,
Quinuclidine | C7H281N | ChemSpider