The preparation of pure 2, 5 dimethyl hexane by means of the Wurtz reaction has been studied and the results show a number of interesting things. One is that the presence of solvent slows down the time of reaction so much as to produce practically none of the desired substance. In the second place, it has been shown that the iso-butyl bromide can be mixed directly with sodium under conditions which will permit of refluxing. In a short time as indicated by the reflux temperature, the reaction is practically complete and yields nearly quantitative are obtained. There is a loss of either bromide or product through the open end of the system in the vapor phase. A study of the velocity factors of this reaction has been made
