Picein
Title: Picein
CAS Registry Number: 530-14-3
CAS Name: 1-[4-(b-D-Glucopyranosyloxy)phenyl]ethanone
Additional Names: p-(acetylphenyl)-b-D-glucopyranoside; 4¢-(b-D-glucopyranosyloxy)acetophenone; p-hydroxyacetophenone-D-glucoside; piceoside; salinigrin; salicinerein; ameliaroside
Molecular Formula: C14H18O7
Molecular Weight: 298.29
Percent Composition: C 56.37%, H 6.08%, O 37.55%
Literature References: In needles and sprouts of Pinus picea L., Picea excelsa Link., Picea glehnii Mast., Coniferae: Tanret, Bull. Soc. Chim. [3] 11, 944 (1894); Kariyone et al., Yakugaku Zasshi 79, 394 (1959), C.A. 53, 14096i (1953). In various willow barks, especially in bark of Salix discolor Muhl., S. nigra Marsh., Salicaceae: Jowett, J. Chem. Soc. 77, 707 (1900); Nonomura, J. Pharm. Soc. Jpn. 75, 80 (1955). In English mistletoe, Amelanchier vulgaris Moench., Rosaceae: Bridel et al., Compt. Rend. 187, 56 (1928). Synthesis: Mauthner, J. Prakt. Chem. [2] 85, 564 (1912).
Properties: Needles or prisms from methanol; mp 195-196°. [a]D23 -88° (c = 1). One gram dissolves in 50 ml water at 15°, in 1 ml boiling water, in ~650 ml abs alc at 15°, in ~40 ml boiling abs alc, in 140 ml ethyl acetate at 15°. Sol in hot glacial acetic acid. Practically insol in ether, chloroform. Hydrolysis with dil mineral acids or with emulsin yields D-glucose and p-hydroxyacetophenone (Piceol). Alkaline hydrolysis yields levoglucosan and p-hydroxyacetophenone: Montgomery et al., J. Org. Chem. 10, 194 (1945).
Melting point: mp 195-196°
Optical Rotation: [a]D23 -88° (c = 1)

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