Photooxidation of several mesoionic compounds gave ring cleavage products, some of which were apparently formed via the endoperoxides of the mesoionicrings. Photooxidation of a Δ2-oxazolin-4-one and a Δ2-thiazolin-4-one gave the corresponding 4,4′-bisoxa- and bisthiazolinone in dichloromethane, whereas the former gave benzamide in dimethylformamide.
1,3-Dipolar cycloaddition reactions. LIII. Question of the 1,3-dipolar nature of .DELTA.2-oxazolin-5-ones
作者:Hans Gotthardt、Rolf Huisgen、Horst O. Bayer
DOI:10.1021/ja00717a034
日期:1970.7
Photochemical and Thermal Reactions of Heterocycles. IV. Phooto-oxidation Reactions of Mesoionic Dithioliumolate, Thiazoliumolate, and Related Heterocycles. Solvent Effects of the Course of the Photo-oxidation