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CAS No. : | 50461-74-0 | MDL No. : | MFCD06410882 |
Formula : | C7H12O3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | YERWBBMSDMSDKT-UHFFFAOYSA-N |
M.W : | 144.17 | Pubchem ID : | 123521 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
71% | With ethanol In water; toluene at 80℃; for 3 h; Heating / reflux | 0.1 mol of 2,2-(dimethylthio)pentanoic acid (11) (19.4 g) was dissolved in 150 ml of toluene and admixed with 2.0 eq of H2O (3.6 ml) and a spatula-tip of p-toluenesulfonic acid monohydrate. Subsequently, the mixture was heated to boiling point and a nitrogen stream was passed through the solution via a frit. After 3 h under reflux, the reaction mixture was cooled to 80° C. and admixed with 200 ml of ethanol and a further spatula-tip of p-toluenesulfonic acid monohydrate. After a further 3 h under reflux, the mixture was cooled to 20° C., 200 ml of water were added and the mixture was extracted three times with 100 ml each time of diethyl ether. The combined ether phases were subsequently washed to neutrality with a dilute sodium hydrogencarbonate solution and dried over magnesium sulfate. After filtration, all of the solvent was drawn off with a rotary evaporator. The ethyl 2-oxovalerate (12) (10.2 g, yield=71percent) was obtained as a pale yellowish oil.1H NMR of ethyl 2-oxovalerate (12) (500 MHz, CDCl3): δ=0.97 (t, 3J=7.3 Hz, 3H, C5H3), 1.37 (t, 3J=7.3 Hz, 3H, OCH2CH3), 1.67 (sext, 3J=7.3 Hz, 2H, C4H2), 2.81 (t, 3J=7.3 Hz, 2H, C3H3), 4.32 (q, 3J=7.3 Hz, 2H, OCH2CH3)13C NMR of ethyl 2-oxovalerate (12) (125.8 MHz, CDCl3): δ=13.5 (OCH2CH3), 14.0 (C-5), 16.6 (C-4), 41.2 (C-3), 62.3 (OCH2CH3), 161.4 (C-1), 194.7 (C-2) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
45% | With dmap; dicyclohexyl-carbodiimide In dichloromethane at 0 - 20℃; for 3.66 h; | A solution of 2-oxopentanoic acid (3.00 g, 25.8 mmol), ethanol (1.20 g, 25.8 mmol) andDMAP (0.32 g, 2.6 mmol) in dichloromethane (30 mL) was cooled with an ice bathbefore a solution of DCC (5.86 g, 28.4 mmol) in dichloromethane (15 mL) was addeddropwise during 30 mm. The reaction mixture was stirred for 10 mm at 0°C, then at roomtemperature for 3 h. The precipitate formed during the reaction was filtered on a sintered glass frit and rinsed with dichloromethane (15 mL). The filtrate was concentrated under reduced pressure (40°C) and the residue taken up in diethylether (100 mL). The organic phase was washed with water (3x 30 mL), an aqueous solution of HC1 (10percent, 3x 30 mL), water (30 mL), a saturated aqueous solution of NaHCO3 (3x 30 mL) and water (30 mL). The aqueous phases were re-extracted with diethylether (100 mL). The combined organicphases were dried (Na2SO4) and concentrated under reduced pressure (45°C). Bulb-to- bulb distillation (120°C, 8 mbar) gave 1.80 (45percent) g of a colorless oil.‘H-NMR (500 MHz): ? 4.32 (q, I = 7.2, 2 H), 2.82 (t, I = 7.2, 2 H), 1.67 (hex., I = 7.4, 2 H), 1.37 (t, I = 7.2, 3 H), 0.97 (t, I = 7.5, 3 H).‘3C-NMR (125.8 MHz): ? 194.67 (s), 161.32 (s), 62.35 (t), 41.14 (t), 16.54 (t), 14.03 (q),13.52 (q). |