Synthesis of polyfunctional O-containing 1,3-dioxepines connected with an acetal fragment by low-temperature ozonolysis

The synthesis of 3,5-dioxo-1,7-heptandials, 3,5-dioxo-1,7-heptanediols and 1,3-dioxo-1,7-heptanedicarboxylic acid derivatives by low-temperature ozonolysis of 1,3-dioxepines was carried out for the first time. It is shown that, depending on the conditions of destruction of the intermediate peroxide products of ozonolysis, the corresponding individual dialdehydes, diols, and diesters can be synthesized with high selectivity.