20 the sum of the carbon numbers of r 1 r 2 r 3 and r 4 is greater than about 30 and a is the anionic moiety with charge q and n and m are integers sufficient to balance out the charges of the anion and quaternary amine moiety preferably r 1 r 2 r 3 and r 4 are unsubstituted alkyl groups thus the quaternary ammonium salt used to modify the ion exchange resin is one with a quaternary ammonium moiety having individual hydrocarbyl substituents with carbon numbers ranging from 1 to about 20 and having a total carbon number of greater than about 30 preferably a total carbon number ranging between greater than about 30 and about 50 and more preferably between greater than about 30 and about 40 and an anionic moiety of hydroxide or an anion of a strong or weak acid the anionic moiety of the quaternary ammonium salt is either the hydroxide or the anion of a strong or weak acid such as for example iodide bromide chloride nitrate sulfate bisulfate thiosulfate acetate oxalate and other carboxylates and the like illustrative examples of quaternary ammonium salts useful in the instant invention are given as follows to prepare the catalysts of the instant invention the ion exchange resin is put into the hydrogen form by contact with an acid if it is.