Alkyl vinyl ketones and acrylic esters were hydroacylated with organotetracarbonylferrates to the corresponding 1, 4-diketones and 4-oxo carboxylic acid derivatives in good yield in dipolar aprotic solvents such as N, N-dimethylacetamide. Addition of 18-crown-6 improved the yield. cis-Jasmone and γ-jasmolactone were synthesized by use of these reactions.