1,1-Dimethoxy-2-methyl-2-acetoxy-but-3-ene → 4,4-Dimethoxy-3-methyl-crotyl acetate

Participants

Reaction Steps

1,800 parts of 1,1-dimethoxy-2-methyl-2-acetoxy-but-3-ene and 1 part of copper (I) chloride were heated, with stirring, at 155°-160° C. in a reaction vessel equipped with a stirrer, an internal thermometer and a descending condenser, the degree of rearrangement being determined by examining small samples by gas chromatography. The low-boiling products formed distilled off continuously over the entire reaction time of 6 hours. Subsequent working up of the reaction mixture by distillation gave 1,444 parts of 4,4-dimethoxy-3-methyl-crotyl acetate. This corresponds to a yield of 80.2% of theory.

Provenance & Evidence