Synthesis of Pyranones and Benzofluorenones from Ketones and Carboxylic Acids1

RL Letsinger, JD Jamison

Index: Letsinger,R.L.; Jamison,J.D. Journal of the American Chemical Society, 1961 ,  vol. 83, p. 193 - 198            

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Citation Number: 26

Abstract

It was reported recently that ketone I condensed with acetic acid in hot polyphosphoric acid to give (76% yield) a substituted 4H-pyran-4-m~(11). 3 This novel reaction appeared particularly interesting since, if general for methylene ketones, it would provide an unusually simple and convenient route to the pyranones. No study of the reactions of methylene ketones with carboxylic acids in polyphosphoric acid seems previously to have been ...