Derivative Type: d-Form
Literature References: Prepd by the action of Aspergillus griseus on the dl-form: McKenzie, Harden, J. Chem. Soc.
83, 430 (1903).
Properties: Crystals. [a]D10 +24.3° (c = 2.226). Sol in water, alcohol, ether.
Optical Rotation: [a]D10 +24.3° (c = 2.226)
Derivative Type: l-Form
Literature References: Found in the urine of diabetics (as much as 30 g per day). Isoln: Fischer, Scheibler, Ber.
42, 1221 (1909); Shaffer, Marriott, J. Biol. Chem.
16, 268 (1913).
Properties: Hygroscopic, monoclinic crystals, mp 45.5-48°. [a]D25 -24.5° (c = 5). K at 22° = 3.86´10-5. Freely sol in water, alcohol, ether. Sparingly sol in benzene. On distn it dec into crotonic acid and water.
Melting point: mp 45.5-48°
Optical Rotation: [a]D25 -24.5° (c = 5)
Derivative Type: dl-Form
Literature References: Prepd from acetoacetic ester by the action of sodium amalgam: Wislicenus, Ann.
149, 207 (1869); Marian, Biochem. Z.
150, 283 (1924); by the oxidation of aldol: Wurtz, Compt. Rend.
76, 1167 (1873); from crotonic acid by heating with dil acid: Wacker,
DE
441003; Frdl.
15, 135; by heating crotonitrile with KOH soln: Bruylants, Bull. Soc. Chim. Belg.
31, 182 (1922).
Properties: Hygroscopic syrup. Volatile with steam. Sol in water, alcohol, ether. On distn it dec into crotonic acid and water.
产品链接: 300-85-6››