The cycloaddition of aroyl and sulfonyl cyanides with 5, 5-dimethoxy-1, 2, 3, 4- tetrahalocyclopentadienes is facilitated by electron-withdrawing substituents. The sulfonyl cyanides have been shown to be more reactive than the aroyl cyanides providing further evidence that delocalization of the? r charge density of the cyano group facilitates the cycloaddition reactions. The effect of solvent on the reaction of benzoyl cyanide and 5, 5- ...
