Acetic Acid → Ethyl 2,4-dimethyl-2-pentenoate

Within a period of 90 min., a solution of triethyl 2-phosphonopropionate (238 g, 1.00 mol) in dimethoxyethane (DME, 150 ml) was added dropwise with stirring under an atmosphere of N2 to a solution of NaH (43.6 g, 1.00 mol) in DME (600 ml). The mixture was then heated to reflux, and after 15 min. at reflux temp., isobutyric aldehyde (72.1 g, 1.00 mol) was added dropwise. After a further 30 min. stirring at reflux, the mixture was poured into ice/water (1:1, 1 L). AcOH (60 ml) was added, and the product was extracted with Et2O (2×200 ml). The combined organic extracts were washed with water (400 ml) and brine (100 ml), dried (Na2SO4), and concentrated in a rotary evaporator. The resulting residue was distilled to provide at 86-75° C./27 mbar 117 g (75%) of 2,4-dimethylpent-2-enoic acid ethyl ester.

1. temperatureThe mixture was then heated
2. temperatureto reflux
3. temperatureafter 15 min. at reflux temp
4. temperatureat reflux
5. extractionthe product was extracted with Et2O (2×200 ml)
6. washThe combined organic extracts were washed with water (400 ml) and brine (100 ml)
7. dry with materialdried (Na2SO4)
8. concentrationconcentrated in a rotary evaporator
9. distillationThe resulting residue was distilled

ORD-Eintrag

ord-461ef08b6d284852ae374eeeb9552cd8

Quelldatensatz

uspto-grants-2008_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07384906B2