中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
N-(苄氧羰基)-L-谷氨酸 | N-benzyloxycarbonyl-DL-glutamic acid | 5619-01-2 | C13H15NO6 | 281.265 |
—— | 4-(2-CARBOXY-ETHYL)-5-OXO-OXAZOLIDINE-3-CARBOXYLIC ACID BENZYL ESTER | 19525-56-5 | C14H15NO6 | 293.276 |
The solid-state conformation of racemic N-methylglutamic acid has been defined by single-crystal X-ray crystallography. Orthorhombic crystals belong to the space group Pbca with a 15.219(2), b 10.583(1), c 9.595(1) Å and Z 8. The structure was refined to a final R value of 0.049 for the 1285 measured data. In the crystal the molecules adopt a zwitterionic form with protonation having occurred at the amino nitrogen atom. The a-carboxyl is unprotonated with the d-carboxy group retaining a proton. The i.r. spectrum shows absorptions which also are indicative of the amino acid being in the zwitterionic form. Intermolecular H-bonds involving the carboxylate proton and the two protons on the N-atom link the molecules into a three-dimensional network in the crystal.