ON CYCLOPENTADIENONE-KETALS AND THEIR DIMERS. A NOVEL REARRANGEMENT OF α,β-UNSATURATED KETONE DIALKYL KETALS

Article abstract of DOI:10.1016/S0040-4039(00)92604-2

The dimers (2a and b) of dimethyl- and diethylcyclopentadienone ketals (1a and b) undergo a novel 1,3-alkoxy-rearrangement to 4(a and b). Mild hydrolysis of 2 or 3 gives the monoketones (3a or b).On strong acid catalysed hydrolysis 2, 3 or 4 afford the cyclopentadienone-dimer (6)