Improved selectivity and decreased formation of overoxygenated byproducts were achieved by using a MeCN/H2O biphasic system for the iron‐catalyzed oxidation of benzene to phenol with H2O2. Under optimized reaction conditions with 5‐carboxy‐2‐methylpyrazine‐N‐oxide as the ligand for iron [Eq. (1)] a benzene conversion of 8.6 % and selectivities based on benzene and H2O2 of 97 and 88 %, respectively, were obtained.
Auf den Punkt gebracht: Der Zeolithkatalysator TS‐1B für die Oxidation von Benzol mit Wasserstoffperoxid wird durch Modifizierung von Titan‐Silicalit mit NH4HF2 und H2O2 erhalten. In Gegenwart von Sulfolan bleibt die Oxidation mit diesem neuen Katalysator selektiv auf der Stufe von Phenol stehen (siehe Schema).
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