Lowering the current to 2 mA was also found to lead to a reduction in reaction performance, and in this case an extended reaction time of 6.5 h was needed in order to obtain 98% yield of 3 (Entries 11). When the current was increased to 10 mA a significantly faster reaction was observed; however, pronounced formation of the dichlorinated product 4 occurred already after 1.5 h (Entries 12-13).