Palladium-catalyzed synthesis of 4-oxaspiro[2.4]heptanes via central attack of oxygen nucleophiles to π-allylpalladium intermediates
A palladium-catalyzed decarboxylative cyclopropanation of γ-methylidene-δ-valerolactones with aromatic aldehydes has been developed to give 4-oxaspiro[2.4]heptanes with high selectivity. The site of nucleophilic attack to a π-allylpalladium intermediate h
ALUMINA AS AN VERSATILE CATALYST FOR THE SELECTIVE ACETALIZATION OF ALDEHYDES
Alumina was found to be an effective and convenient catalyst for acetalization of aldehydes to the corresponding 1,3-dioxoranes and 1,3-dioxanes.It can be used for selective protection of only formyl group of ketoaldehydes.