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Orange-colored 7,8-dimethyl-2,3,12,13-tetramethoxy-(15H,17H)-tripyrrin-1,14-dione and its 2,3,7,8,12,13-hexaethyl analog were synthesized and converted to fluorescent derivatives by bridging a lactam nitrogen to the adjacent pyrrole nitrogen in a reaction with carbonyldiimidazole. The tripyrrindiones were also converted to the corresponding mono lactim methyl ethers by reaction with neat trimethylphosphite,...
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