Historical The chemistry of the dimethylbenzenes has been well worked out, while the corresponding ethyl derivatives have been studied to a relatively small extent. The first work upon diethylbenzenes was done by Fittig and Konig, who prepared them from bromobenzene and ethyl chloride by the Fittig synthesis. Aschenbrandt4 described the preparation of p-diethylbenzene by the Fittig synthesis and from it made several ...