
Keywords: Peptide bond hydrolysis; Metal ions; Lewis acid; N â O acyl rearrangement; 1:1 Zr(IV)-Ld POM; Zr(IV)-substituted Lindqvist type polyoxometalate (Me4N)2[W5O18Zr(H2O)3]; 1:2 Ce(IV)-Kg POM; Ce(IV)-substituted Keggin-type polyoxometalate [Ce(α-PW11O39)2]