PART-2: without PTC catalyst, the sodium thiolate ion (Ta) (initiation) attacks another molecule of 3 to give the symmetrical trithiocarbonate (TTC) 5 and 3-mercapto-1-propanesulfonicacid thiolate ion (Tb), as soon it forms, it will attack another molecule 3 to give the stable undissociated di sodium salt (6) by liberating sodium thiolate ion (Tc), so that propagation of reaction goes on until consumption of 3. The aliquot workup shows symmetrical trithiocarbonate (3h and 3i), which disappears after12 h at room temperature. It is also confirmed that disulfide (DS) is not forming from trithiocarbonate (TTC) by doing independent reaction.