Halodediazoniations of Dry Arenediazonium <i>o</i>-Benzenedisulfonimides in the Presence or Absence of an Electron Transfer Catalyst. Easy General Procedures To Prepare Aryl Chlorides, Bromides, and Iodides
The paper reports the results of a wide study aimed at preparing aryl chlorides 3 (19 examples), bromides 4 (19 examples), and iodides 5 (9 examples) by halodediazoniation of dry arenediazonium o-benzenedisulfonimides 1 with tetraalkylammonium halides 2. The reactions were carried out in anhydrous acetonitrile at room temperature ( approximately 20 degrees C) in the presence of copper powder and at