iodine; copper dichloride; aluminium trichloride in nitromethane T=40°C; 4 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;
Fittig
Justus Liebigs Annalen der Chemie, 1862 , vol. 124, p. 276,285
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Schultz
Justus Liebigs Annalen der Chemie, 1874 , vol. 174, p. 225