Acetone → 1-Methoxy-2,4-pentanedione

To a solution of sodium (5.83 g, 243.3 mmol) in dry toluene (62.5 mL) was added ethyl (methyloxy)acetate (24 g, 203.4 mmol) at −5° C. After stirring for 3 h, acetone (14 g, 231.4 mmol) was slowly added, upon which the mixture became brown and viscous. Next added 72 mL of tert-butyl methyl ether, and the reaction mixture was stirred at room temperature for 12 h, after which time the sodium salt precipitated. After collection and washing with additional tert-butyl methyl ether, the sodium salt was dissolved in 46 mL of 20% H2SO4. The contents were extracted with tert-butyl methyl ether and the organic layers concentrated to afford 1-(methyloxy)-2,4-pentanedione (9.76 g, 36.9%). 1H NMR (400 MHz, CDCl3-d3) δ 5.76 (s, 1H), 3.96 (s, 2H), 3.38 (s, 3H), 2.07 (s, 3H).

1. stirringthe reaction mixture was stirred at room temperature for 12 h
2. customafter which time the sodium salt precipitated
3. customAfter collection
4. washwashing with additional tert-butyl methyl ether
5. dissolutionthe sodium salt was dissolved in 46 mL of 20% H2SO4
6. extractionThe contents were extracted with tert-butyl methyl ether
7. concentrationthe organic layers concentrated

ORD record

ord-3e82662d1dfc4d93bcee4b750c49d90c

Source dataset

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08536179B2