PMA/KAP was obtained by supporting phosphomolybdic acid on PPh3 functionalized KAP.
PMA/KAP is active and stable catalyst for olefin oxidation with H2O2/ethyl acetate.
Multi-weak interaction exits between PMA unit and PPh3 ligands knitted in the KAP.
Degradation of PMA to small species can be inhibited by the multi-weak interaction.