Publication Date:
2019-08-23
Description:
The synthesis, crystal structure and structural motif of two thiophene-based cyanoacrylate derivatives, namely, ethyl (E)-2-cyano-3-(3-methylthiophen-2-yl)acrylate (1), C11H11NO2S, and ethyl (E)-2-cyano-3-(thiophen-2-yl)acrylate (2), C10H9NO2S, are reported. Derivative 1 crystallized with two independent molecules in the asymmetric unit, and derivative 2 represents a new monoclinic (C2/m) polymorph. The molecular conformations of 1 and the two polymorphs of 2 are very similar, as all non-H atoms are planar except for the methyl of the ethyl groups. The intermolecular interactions and crystal packing of 1 and 2 are described and compared with that of the reported monoclinic (C2/m) polymorph of derivative 2 [Castro Agudelo et al. (2017). Acta Cryst. E73, 1287–1289].
Electronic ISSN:
2056-9890
Topics:
Chemistry and Pharmacology
,
Geosciences
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