CATALYTIC IODINATION OF ACETYLENE IN THE IODOPALLADATE(II)–I^––I2–MeOH SYSTEM

We have studied the kinetics of catalytic iodination of acetylene to form trans-1,2-diiodoethylene in the system Pd^II–NaI–I2–MeOH at 55 °C. The results obtained allow us to hypothesize that the reaction includes a step of iodopalladation of acetylene with intermediate formation of an sigma-iodovinyl derivative of palladium, the decomposition of which by reductive elimination yields the end product and regenerates the catalyst.