Abstract: Method for preparing bibenzyl systems with nitro groups as substituents. Toluene derivates with nitro groups are coupled oxidatively in methanolic alkali solution under influence of metal catalysts. The oxidation is preferably done with air. As catalysts metal acetonylacetonates are used. The metal can be Ni, Cu, Co, Mn, Cr or Ti. This catalyst can be used together with a crown ether. Another suitable catalyst is a metal tetraphenylporphin of porfyrin type where the metal can be Ni, vanadium (V=O) or Fe(FeIII).
Abstract: A method is disclosed for the dealkylation of alkylaryl ethers by reaction with aluminum triodide under reflux. The reaction is carried out in the presence of a catalytic amount of a quaternary ammonium iodide in a substantially non-aqueous organic solvent. The reaction product is then hydrolyzed with water. The quaternary ammonium iodide can be of the formula R.sub.4 N.sup.+ I.sup.-, wherein R is alkyl, and the solvent is preferably benzene or cyclohexane.