Download 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. ... The intermolecular Knoevenagel condensation of β-hemiacetyl ester proceeds by an in situ unmasking of a reactive ω-hydroxy-β-keto ester giving unsaturated ω-hydroxy-β-keto esters 6–12 which accommodate acetal formation. ... Treating ethanolic 5a with p-nitrobenzaldehyde and piperidine at ...
