4-Iodo-1, I, 1, 2, 2, 3, 3-heptafluorobutane.-The procedure utilized was essentially that described previously5 except that the potassium halides were used rather than the lithium. The p-toluenesulfonate or benzenesulfonate, a 50% excess of the potassium halide, and sufficient diethylene glycol to form a slurry were placed in a 1-necked flask of appropriate size having a thermometer well and fitted with short glass-helices-packed column ...
