The adition is slow because the benzyne formed is unstable, so itcould react with the reagent and form other species. The driving force of the reaction is the formation of stableproducts (N2 and CO2), but you are right,benzyne is so unstable that it can react with the solvent oranother compound present in the medium. Solution The adition is slow because the benzyne formed is unstable, so itcould react with the reagent and form other species. The driving force of the reaction is the formation of stableproducts (N2 and CO2), but you are right,benzyne is so unstable that it can react with the solvent oranother compound present in the medium..