The synthesis of hydroperoxymethyl oxazoles by oxidation of alkylideneoxazoles with molecular oxygen was implemented in a microstructured reactor for increased safety and larger-scale applications. Elaborate studies on the influence of pressure and temperature were performed, and the apparent activation energy for the oxidation reaction was determined. Elevated temperatures up to 100 °C and pressures up to 18 bar(a) led to a conversion rate of approximately 90% within 4 h of the reaction time, thus displaying the high potential and beneficial effect of using a microreactor setup with liquid recycle loop for this oxidation. The in situ reduction of the generated hydroperoxide functionality shows the capability of this setup for follow-up transformations.
Oxazole–hydroperoxide 3as a colorless solid. Rf (PE/EA 3:1 = 0.31).
1H NMR (30 MHz, CDCl3) δ = 4.98 (s, 2H), 7.12 (s, 1H), 7.49–7.29 (m, 3H), 7.88–7.75 (m, 2H), 10.16 (s, 1H). GC-MS (EI) m/z = 173.1 (M – OH), 144.1 (M – CH2OOH), 116.1 (M – C6H5 + 2H), 89.1.
Safe and Fast Flow Synthesis of Functionalized Oxazoles with Molecular Oxygen in a Microstructured Reactor
Im Neuenheimer Feld 270
Professor (Full)Hochschule Mannheim · Institute of Chemical Process EngineeringGermany · Mannheim
Sep 2005–Aug 2009
Laboratory HeadNovartis · Chemical and Analytical Process DevelopmentSwitzerland · Basel
Sep 1999–Aug 2004
PhD StudentUniversität Paderborn · Department of Chemistry · Physical Chemistry Prof. KitzerowGermany · Paderborn
Professor (Full)Hochschule Mannheim · Institute of Chemical Process EngineeringGermanyLectures in: Chemical Reaction Engineering Thermodynamic Microreactors & Nanotechnology CFD Practical Course: Chemical Reaction Engineering
Oct 1999–Oct 2004
Universität PaderbornPhysical Chemistry · Dr. rer. nat.Germany · Paderborn
Sep 1994–Sep 1999
Universität PaderbornChemistry · Diplom ChemikerGermany
Prof. Dr. A. Stephen K. Hashmi
/////////Safe and Fast, Flow Synthesis, Functionalized Oxazoles, Molecular Oxygen, Microstructured Reactor