Abstract
We report a one-pot formation of 2,4-diolefinic or 2,4,6-triolefinic monocarboxylic acids, R-(CH[bond, double bond]CH)2or3-COOH, by decarboxylative condensation of an optionally α,β-unsaturated aldehyde with glutaconic acid, HOOC-CH2-CH[bond, double bond]CH-COOH as straight chain C4-extender. The reaction is broadly applicable to saturated and unsaturated aldehydes and opens up a simple gateway to valuable organic products and reactive intermediates.