J. D. Groot, J. Lugtenburg
Sep 2, 2010
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Influential Citations
4
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Journal
Recueil des Travaux Chimiques des Pays-Bas
Abstract
Condensation of 1,3,4-trimethyl-1,5-dihydro-2H-pyrrol-2-one, prepared in high yield from 3,4-dimethylpyrrole, with pyrrole-2-carboxaldehyde and 1-methylpyrrole-2-carboxaldehyde gives a mixture of Z- and E-1,3,4-trimethyl-2,2′-pyrromethen-5[1H]-one (7 and 8) and 1,1′,3,4-tetramethyl-2,2′-pyrromethen-5[1H]-one (9 and 10), respectively. The Z and E forms both isomerise thermally upon heating in basic methanol to the same equilibrium state as is observed during the synthesis. Upon irradiation with light (λ > 360 nm), 7, 8, 9 and 10, similarly undergo Z-E isomerisation.