Isodehydroacetic acid and ethyl isodehydroacetate
CAS index name: Coumalic acid, 4,6-dimethyl-, and coumalic acid, 4,6-dimethyl-, ethyl ester
Organic Syntheses

A checked procedure from Organic Syntheses, the journal whose preparations are repeated in a second laboratory before publication. The full experimental, with amounts, hazards and characterisation data, is on orgsyn.org.
Reagents
| Compound | Role | Equiv | MW (g/mol) | ρ (g/mL) | Safety |
|---|---|---|---|---|---|
| Ethyl 4,6-dimethyl-2-oxo-2H-pyran-5-carboxylate3385-34-0 · C10H12O4 | product | — | 196.20 | 1.160 | Warning |