| 摘要 |
An unsaturated carbonyl compound, for example, one expressed by the following formula, <IMAGE> is prepared by maintaining at an elevated temperature a novel allyl acetal of a beta , gamma -unsaturated aldehyde, for example, one expressed by the following formula <IMAGE> The allyl acetal can be derived, for example, for 3-methyl-3-butenal-1 having 5 carbon atoms and prenyl alcohol having 5 carbon atoms. Thus, the unsaturated aldehyde having the increased number of carbon atoms can be formed in a high yield by a relatively simple reaction. |
