Various procedures for the preparation of benzylidene-flavanones have been examined and von Kostanecki's method was found to give best results. A number of new 6-nitroflavanones are reported.
In a study of the KOSTANECKI‐ROBINSON reaction of 2,4‐diacetoxy‐6‐hydroxy‐propiophenone the rate constants and the order of each step have been approximately determined and compared. Mechanism for the reaction is suggested.
Die Kostanecki‐Robinson‐Reaktion des Propiophenons (I) in Gegenwart von Basen (Triäthylamin oder Na‐acetat) über die Zwischenstufen (II) und (III) zum Chromon (IV) wird kinetisch untersucht.
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