Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... 1,4-diketones and 4-ketoaldehydes dimethylacetals can be prepared in good yields (65%–82%) by the cerium(IV) ammonium nitrate promoted reaction of ketones with isopropenyl acetate and vinyl acetate, respectively. ... A convenient synthesis of 1,4-diketones and 4- ...