“…5,6 Synthesis of substituted diiododienes is a well-developed area, however, preparation of unsubstituted derivatives is a challenging problem. 5,6 Synthetic routes developed for substituted alkynes are generally not suitable for acetylene, and preparation of each C 4 H 4 I 2 compound requires a special procedure to be designed. Moreover, highly reactive nature of these derivatives is reflected by many side reactions, which can take place even in the absence of metal catalysts (free-radical reactions, dimerization, photochemical transformations, polymerization, deiodination, etc.).…”