Properties: Prisms from methanol or methanol + acetone, mp 278-282°. [a]D19 +21.1 ± 4° (c = 0.521 in methanol). Absorption max (98% H2SO4): 230, 415 nm (E1%1cm 460, 430). Sol in alcohol, methanol, pyridine; sparingly sol in acetone, chloroform; practically insol in benzene, ether. Dissolves in concd H2SO4 with a bright golden color which slowly turns green and then indigo. In dil pyridine soln gives a deep red color with alkaline nitroprusside soln. When recrystallized from pyridine, it forms long microplatelets contg ~1 mol of the solvent and melting at 258° with effervescence. Is not precipitated with digitonin. Yields sarmentogenone on oxidation.
Melting point: mp 278-282°; melting at 258°
Optical Rotation: [a]D19 +21.1 ± 4° (c = 0.521 in methanol)
Absorption maximum: Absorption max (98% H2SO4): 230, 415 nm (E1%1cm 460, 430)
Derivative Type: Diacetate
Percent Composition: C 68.33%, H 8.07%, O 23.60%
Properties: Needles from abs ether, mp 135-155°. Not affected by CrO3 in acetic acid.
Melting point: mp 135-155°
Derivative Type: Dibenzoate
Percent Composition: C 74.22%, H 7.07%, O 18.71%
Properties: Flat hexagonal prisms from acetone, mp 281°. [a]D20 +14° (acetone). Sparingly sol in alc; practically insol in ether. Not affected by CrO3 in acetic acid.
Melting point: mp 281°
Optical Rotation: [a]D20 +14° (acetone)
Status: This monograph has been retired and is no longer subject to revision or update.
产品链接: 76-28-8››