Stock solution of potassium thioacetate (10 % of thioester linkages calculated in pDOT) was prepared in anhydrous DMF and it was added to pDOT (20 mg) solution prepared in the same solvent after degassing as mentioned in the section 2.5.2. It was sealed and stirred at RT for 2 days. 1 H NMR and SEC analysis were done after evaporating the solvent and dissolving the residue in CDCl3 and THF respectively.