The formation of ozonides by electron transfer induced photo-oxidation of small-ring cycloalkenes
作者:Gary P. Kirschenheuter、Gary W. Griffin
DOI:10.1039/c39830000596
日期:——
Several polymethyl-1,2-diphenylcyclobutenes have been subjected to photo-oxidation in acetonitrile in the presence of 9,10-dicyanoanthracene and it is possible to isolate the corresponding ozonides, in moderate yields (ca. 13%), apparently formed from oxirans produced in a primary step; 1,4-diketones are not generated from the ozonides under the reaction conditions although they are formed as reaction
�bertragung von drei Sauerstoffen auf die olefinische Doppelbindung von 1,2-Diphenylacenaphthen und 1,2-Diphenyl-3,3,4,4-tetramethylcyclobuten
作者:Kurt Schank、Michael Buschlinger
DOI:10.1002/prac.19953370143
日期:——
The olefinic double bond of 1,2-diphenylacenaphthylene (1) is cleaved into its ozonide 2 (respectively into its Baeyer-Villiger rearrangement product 3) via two independent pathways: Pathway A represents the classical ozonolysis (simultaneous three-oxygen transfer) followed by a Baeyer-Villiger rearrangement, pathway B utilizes a two-step three-oxygen transfer; usual epoxidation (mono-oxygen transfer) is followed by C,C homolysis yielding a deep red diradical which shows fast two-oxygen addition (two-oxygen transfer) of molecular oxygen. The labile intermediate ozonide 2 suffers quantitative Baeyer-Villiger rearrangement under reaction conditions necessary to achieve oxirane C,C-cleavage. Therefore, the particularly stable ozonide 11 from 1,2-diphenyl-3,3,4,4-tetramethylcyclobutene (10) is prepared according to pathway B starting from Arnolds's oxirane 12. Both oxidation methods are compared with regard to ozonide formations from olefins.
GRIFFIN, G. W.;KIRSCHENHEUTER, G. P.;VAZ, C.;UMRIGAR, P. P.;LANKIN, D. C.+, TETRAHEDRON, 1985, 41, N 11, 2069-2080
作者:GRIFFIN, G. W.、KIRSCHENHEUTER, G. P.、VAZ, C.、UMRIGAR, P. P.、LANKIN, D. C.+