Derivative Type: DL-Form
Properties: Minute leaflets from alcohol or water, mp 303° (closed capillary). pK1¢ 2.36; pK2¢ 9.72. Sublimes without decompn. One gram dissolves in 10 ml water at 18°. Freely sol in hot water; practically insol in alcohol, ether, chloroform, ethyl acetate, petr ether.
Melting point: mp 303° (closed capillary)
pKa: pK1¢ 2.36; pK2¢ 9.72
Derivative Type: L(+)-Form
Properties: Crystals from dil alc. mp ~305° (closed capillary). [M]D +29.2° (5N HCl); [M]D +41.0° (glacial acetic acid). [a]D20 +23.0° (c = 10 in 20% HCl). Freely sol in hot water; insol in alcohol, ether, chloroform, ethyl acetate, petr ether.
Melting point: mp ~305° (closed capillary)
Optical Rotation: [a]D20 +23.0° (c = 10 in 20% HCl)
Derivative Type: D(-)-Form
Properties: Minute leaflets. mp ~307°. [a]D20 -24.2° (c = 10 in 20% HCl). Freely sol in hot water; insol in alcohol, ether, chloroform, ethyl acetate, petr ether.
Melting point: mp ~307°
Optical Rotation: [a]D20 -24.2° (c = 10 in 20% HCl)
产品链接: 6600-40-4››