Properties: Prisms from acetone, mp 251-253°. Somewhat hygroscopic. [a]D20 +20.5 ±2°; [a]20546 +26.3 ±2° (c = 0.6 in methanol). Absorption max (98% w/w H2SO4): 230, 310, 390, 480, 560 nm (E1%1cm 185, 175, 315, 230, 120). Sol in alcohol, dil alcohol, dioxane; slightly sol in acetone. One part sol in 1000 parts water and in 2000 parts chloroform at 25°.
Melting point: mp 251-253°
Optical Rotation: [a]D20 +20.5 ±2°; [a]20546 +26.3 ±2° (c = 0.6 in methanol)
Absorption maximum: Absorption max (98% w/w H2SO4): 230, 310, 390, 480, 560 nm (E1%1cm 185, 175, 315, 230, 120)
Derivative Type: Acetyldiginatin-a
Percent Composition: C 61.56%, H 7.93%, O 30.51%
Properties: Flat plates from methanol + chloroform+ ether, mp 199-202°. [a]D20 +30.1° (c = 0.6 in pyridine). uv max: 218 nm (log e 4.1).
Melting point: mp 199-202°
Optical Rotation: [a]D20 +30.1° (c = 0.6 in pyridine)
Absorption maximum: uv max: 218 nm (log e 4.1)
产品链接: 52589-12-5››