SCHEDULED MAINTENANCE
The condensation of ethyl 2-(2-oxo-3-indolinylidene)-2-hydroxyacetate (III) with propionic anhydride in the presence of pyridine results in the production of an insoluble red-brown pigment which has been characterised as 3,4-dimethyl-2,5-di-(2-oxo-N-propionyl-3-indolinylidene)-2,5-dihydrofuran (V). A possible mode of formation of the pigment is discussed.
M. Alam and J. A. Ballantine, J. Chem. Soc. C, 1968, 255 DOI: 10.1039/J39680000255
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