L-Tartaric acid diethyl ester
| Name | L-Tartaric acid diethyl ester | |
| Synonyms | Diethyl L-tartrate | |
| Name in Chemical Abstracts | Butanedioic acid, 2,3-dihydroxy-, diethyl ester, (2R,3R)- | |
| CAS No | 87-91-2 | |
| EINECS No | 201-783-3 | |
| Molecular formula | C8H14O6 | |
| Molecular mass | 206.20 | |
| SMILES code | CCOC(=O)[C@H](O)[C@@H](O)C(=O)OCC | |
| 1H-NMR: L-Tartaric acid diethyl ester | |||
| 250 MHz, CDCl3 | |||
| delta [ppm] | mult. | atoms | assignment |
| 1.33 | t | 6 H | CH3 ethyl |
| 3.18 | m | 2 H | OH |
| 4.32 | q | 4 H | CH2 ethyl |
| 4.54 | s | 2 H | 2-CHOH, 3-CHOH |
| 7.26 | CHCl3 | ||
13C-NMR |
| 13C-NMR: L-Tartaric acid diethyl ester | |||
| 250 MHz, CDCl3 | |||
| delta [ppm] | assignment | ||
| 14.14 | CH3 ethyl | ||
| 62.48 | CH2 ethyl | ||
| 72.05 | C2, C3 (CHOH) | ||
| 171.59 | C1, C4 (CO-O) | ||
| 76.5-77.5 | CDCl3 | ||
IR |
| IR: L-Tartaric acid diethyl ester | |||
| [Film, T%, cm-1] | |||
| [cm-1] | assignment | ||
| 3500 | O-H valence | ||
| 2985, 2940 | aliph. C-H valence | ||
| 2910 | aliph. C-H valence | ||
| 1745 | C=O valence, ester | ||
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; Side reactions |
Acid catalyzed reaction of L-(+)-tartaric acid with ethanol to L-(+)-tartaric acid diethyl ester |
Operating scheme |
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Chromatogram |
| HPLC: crude product | |
| column | Phenomenex Luna C18; particle diameter 3 µm, L= 150 mm, ID= 4.6 mm |
| column temperature | 25 °C |
| injection | 15 µL |
| mobile phase | gradient: 3% methanol/water --> 98% methanol/water in 30 min, 10 min isocratic |
| flow | 0.6 mL/min |
| detector (UV 220 nm) | percent concentration calculated from relative peak area |
| GC: pure product | |
| column | Zebron ZB-1, L=15 m, d=0.25 mm, film=0.25 µm |
| inlet | injector: 250°C, split injection, 0.2 µl |
| carrier gas | He, pre-column pressure 90 kPa |
| oven | 30°C (4 min), 20°C/min --> 240°C (7 min) |
| detector | FID, 230°C, H2 30.8 mL/min, synth. air 361 mL/min |
| integration | percent concentration calculated from relative peak area Tanzania - Wikipedia, the free encyclopedia
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Maasai/Tanzaniai. The Maasai are one of the world’s most famous and largest tribes in Africa. They are polygamous, with men allowed to have up to ten wives, and women expected to marry and bear children from the age of 14.       Tanzania's port city of Dar es Salaam             |
