Ethyl Acetoacetate → HCID 20191525, compound

Participants

Reaction Steps

2,5-Dimethyl-2,4-hexadiene and ethyl acetoacetate were reacted utilizing the oxidative addition procedure to obtain 4-carbethoxy-2-(2-methyl-1-propenyl)-3,3,5-trimethyl-2,3-dihydrofuran. Manganese (III) acetate obtained by the reaction potassium permanganate (19.75 grams) and manganese (II) acetate (122.5 grams) in 250 mls acetic acid was employed for the oxidation. The 2,5-dimethyl-2,4-hexadiene (27.5 gram) and ethyl acetoacetate (32.5 grams) were reacted in the presence of 0.5 grams cupric acetate catalyst. 4Carbethoxy-2-(2-methyl-1-propenyl)-3,3,5-trimethyl-2,3-dihydrofuran was recovered (61% yield) and hydrogenated in ethanol using a supported palladium catalyst (5% Pd on carbon) to obtain 4-carbethoxy-2-(2-methylpropyl)-3,3,5-trimethyl-2,3-dihydrofuran. Essentially pure (97+%) 4-carbethoxy-2-(2-methylpropyl)-3,3,5-trimethyl-2,3-dihydrofuran (B.P. 136° C. @9.2 mm Hg; nD23° 1.4642) was obtained upon distillation of the crude product. The product had a green vegetable odor. The structure of the product ##STR23## was confirmed by infrared and nuclear magnetic resonance.

Provenance & Evidence