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An unexpected discovery of new trans-4-acetyl-1,9-dimethyl-4,4a-dihydro-3H-fluoren-3-ones from one pot reactions of benzaldehydes and acetylacetone is described. The synthetic mechanism and stereochemistry were discussed. These new derivatives exhibit good fluorescent properties in solutions.

Graphical abstract: New fluorescent trans-dihydrofluoren-3-ones from aldol–Robinson annulation–regioselective addition involved one-pot reaction

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