PURPOSE: To obtain the titled compound useful as an intermediate for citral, etc., by bringing prenol in the vapor phase into contact with O2 in the presence of a catalyst containing silver, copper and a basic metal oxide supported on a carrier having a specific surface area to carry out the oxidative dehydrogenation.
CONSTITUTION: 3-Methyl-2-buten-1-ol (prenol) in the vapor phase and molecular oxygen are subjected to oxidative dehydrogenation in the presence of a catalyst containing three components of silver, copper (preferably at 99:1W50:50 weight ratio) and a basic metal oxide (preferably 0.01W0.5wt% based on the carrier) supported on a carrier having <3m2/g specific surface area, preferably quartz, molten alumina or molten silica, at 300W600°C, preferably 400W500°C to give the aimed 3-methyl-2-buten-1-al (senecioaldehyde).
USE: A synthetic intermediate for citral, β-ionone and chrysanthemumic acid.
YAMAMOTO FUMIO
KIYOU SUNAO
