Chloroacetic Acid → Methyl 2-(propan-2-yloxy)acetate

116.5 g of the sodium salt of chloracetic acid are slowly added at 80° C. to a sodium isopropoxide solution (freshly prepared from 23 g of sodium and 250 ml of isopropylalcohol). The reaction mixture is refluxed for 2 hours and then combined with 500 ml of water. The mixture is evaporated down to a total volume of 200 ml and adjusted to pH1 with conc. sulphuric acid. The precipitate formed is filtered off, the two phases of the filtrate are and the organic phase is fractionally distilled in vacuo (101–103° C./10 Torr; 83 g; 70%). The 2-isopropoxy-acetic acid thus obtained is heated together with 0.2 ml of conc. sulphuric acid in 57 ml of methanol and 200 ml benzene for 7 hours using a water separator. After the excess methanol has been distilled off the residue is fractionally distilled in vacuo (50–55° C./10 Torr; 81.6 g; 88%).

1. temperatureThe reaction mixture is refluxed for 2 hours
2. customThe mixture is evaporated down to a total volume of 200 ml
3. customThe precipitate formed
4. filtrationis filtered off
5. distillationthe organic phase is fractionally distilled in vacuo (101–103° C./10 Torr; 83 g; 70%)

ORD-Eintrag

ord-faf946cd246b4927b6643b340c7050b9

Quelldatensatz

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07173028B2