Summary.
The reaction of 2-aminomethylene-2,3-dihydropyrrol-3(1H)-ones with ethyl bromoacetate, chloroacetonitrile, or dilute HCl gave rise to a series of methine dyes, namely 1-aryl-2-[3-hydroxy-1-aryl-4,5-diphenyl-1H-pyrrol-2-yl]methylene-4,5-diphenyl-2,3-dihydropyrrol-3(1H)-ones.
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Gomaa, MM., Döpp, D. New Dipyrrinonols Derived from 2,3-Dihydro-1H-pyrrol-3-ones. Monatshefte für Chemie 136, 169–175 (2005). https://doi.org/10.1007/s00706-004-0235-1
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DOI: https://doi.org/10.1007/s00706-004-0235-1