�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.