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Constituents of propolis of Czechoslovak origin V.

M. Nagy, V. Suchý, D. Uhrín, K. Ubik, M. Buděšinský, and D. Grančai

Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University, CS-832 32 Bratislava

 

Abstract: The ethanolic extract of crude propolis was divided into five fractions by treatment with mutually immiscible solvents, namely into the interphase, and methanolic, ethyl acetate, light petroleum, and aqueous portions. Separation of the interphase afforded a new flavonoid — 3,7-dihydroxy-5-methoxyflavone (galangin 5-methyl ether), whilst the methanolic portion furnished (2R,3R )-3,7-dihydroxy-5-methoxyflavanone (pinobanksin 5-methyl ether), and (2E,4E)-5-phenyl-2,4-pentadienoic acid (cinnamylideneacetic acid). Structure of these products was determined by spectral means.

Full paper in Portable Document Format: 425a691.pdf

 

Chemical Papers 42 (5) 691–696 (1988)

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