2,4,5-Triphenyloxazol – Neues Darstellungsverfahren und Eigenschaften bei photoinduzierten Elektronentransfer-Reaktionen

2,4,5-Triphenyloxazole – New Preparative Pathway and Properties in Photoinduced Electron Transfer Reactions The reaction between desylchloride and sodium azide in boiling methanole leads to 2,4,5-triphenyl oxazole (TPO) c in good yields. This new synthetic course can be used for the synthesis of other triaryl substituted oxazoles too. The shortlived excited singlet state of TPO acts as electron donor (towards several types of onium compounds) and as electron acceptor (towards triethanole amine), and is quenched very efficiently. The photo-induced electron transfer reaction with onium salts results in the homolytic decomposition of the neutral radicals of these compounds with moderate quantum yields. All systems investigated can be used as photo-initiators for the free radical polymerization of methyl methacrylate.