As shown before, the use of different solvents at 60 °C reaction temperature and a CuCl/CuCl2 system reveal that the conversion can be drastically increased if pure alcohol with longer alkyl chains serves as solvent (ethanol < iso-propanol < 1-octanol). Additionally, with the higher conversion, the reaction lacks control due to the appearance of more star-star coupling side reactions which can be observed via SEC.