A novel stereoselective and catalytic C—C coupling reaction: acetylene dimerization accompanied by addition of iodine to yield (E,E)-1,4-diidobuta-1,3-diene in the PtIV-I--I2-MeOH system

A new catalytic reaction-dimerization of acetylene accompanied by addition of iodine to yield (E,E)-1,4-diiodobuta-1,3-diene at 30°C in a methanolic solution of NaI, Pt^IV and I₂ has been found; a plausible reaction mechanism involves intermediate formation of a cis-divinyl derivative of platinum(IV) through two subsequent triple bond iodoplatination steps followed by reductive elimination of the final product.