.2,7 - Dimethyl-2, 4,6 - Octatriene -1,8 - Dialdehyde Synthesis And Study

2,7-dimethyl-2,4,6-octatriene-l,8-dial is an important intermediate of synthesize carotenoids. A commercial and practical synthesis rout with (E)-2-(3-acetoxy-l-me-thyl-l~propenyl)-5,5-dimethyl-l,3-dioxane as starting material by couple,oxidation, Ramberg-Backlund and deprotection is chosen and studied in this paper.The first couple reaction can be finished moderately and quantificationally. The optimum yield is 96.3%.The optimum process conditions of the second reaction are: dropping time of oxidizer is 2 hour, reaction time is 4 hour, reaction temperature is 25℃ and the yield is 86.6%. The third step is a Ramberg-Backlund reaction. The yield of this reaction is 82.9% when reaction time is 8 hour, mole ratio of potassium hydroxide to material is 7 and potassium hydroxide is added into solvent. The finally reaction is an equilibrium reaction. The yield of this step is 78.1%.