CONTROLLED PREPARATION OF NEOALKANALS AND NOVEL CYCLIC DIOXEPENES, DEPENDING UPON THE USE OF SHAPE-SELECTIVE AND NON SHAPE-SELECTIVE CATALYSTS

Rearrangement of m-dioxanes to neoalkanals was researched in the temperature range between 250 degrees C and 400 degrees C with zeolitic molecular sieve catalysts. Generally, the conversions are about 40%-80%, while the selectivities often are higher than 90%. In case, that m-dioxanes with an additional ether-function in the side-chain were used, novel cyclic dioxepenes were obtained. Several investigations were done to improve the controlled preparation of the neoalkanals, among them the use of the CVD-method.