The report that fused acetal derivatives can be obtained from oxidative cycloaddition
of 1,3-diketones or 1,3-diketo esters to cyclic enol ethers using tetrabutylammonium
peroxydisulfate was proved to be erroneous. Under these reaction conditions fused
acetals were neither isolated nor confirmed.
enols - ethers - cycloadditions - acetals - sulfates