Hydrochloric Acid → Methyl 3-hydroxypivalate

To a stirred solution of 30.0 grams (0.22 mole) of 3-chloro-2,2-dimethylpropionic acid in 100 ml of absolute methanol was added dropwise 35.6 grams (0.66 mole) of a methanolic solution 25% in sodium methoxide. The exothermic reaction caused the reaction mixture temperature to rise to 40°. Upon completion of addition the reaction mixture was heated at reflux for 4 hours, then cooled to ambient temperature where it was stirred for one hour. The reaction mixture was acidified with concentrated hydrochloric acid and 150 ml of water was added. The mixture was extracted with four portions of 100 ml each of methylene chloride. The combined extracts were dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to give 20.8 grams of methyl 3-hydroxy-2,2-dimethylpropionate as an oil.

1. customThe exothermic reaction
2. customto rise to 40°
3. additionUpon completion of addition the reaction mixture
4. temperaturewas heated
5. temperatureat reflux for 4 hours
6. additionwas added
7. extractionThe mixture was extracted with four portions of 100 ml each of methylene chloride
8. dry with materialThe combined extracts were dried with magnesium sulfate
9. filtrationfiltered
10. concentrationThe filtrate was concentrated under reduced pressure

ORD record

ord-dc906fa41be443c89481463d9f3eaca3

Source dataset

uspto-grants-1983_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04405357