Abstract
X-ray diffraction studies are reported for six indolinones. The results show that two different types of associates are present in the crystal state of the compounds having an NH group. The indolinone molecules without any substituents form cyclic dimers while those with one or two methyl groups attached to the C3 atom of the lactam ring form infinite hydrogen bonded chains. It is confirmed that the lactam moiety forms a typical planar amide structure with no sign of the enol form present.
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Lipkowski, J., Luboradzki, R., Stefaniak, L. et al. X-ray diffraction study of some indolinones. J Chem Crystallogr 25, 299–308 (1995). https://doi.org/10.1007/BF01796054
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DOI: https://doi.org/10.1007/BF01796054