Divergent Pathways in the Reaction of Hexamethylbenzene with Dimethyldioxirane<sup>1</sup><sup>,</sup><sup>2</sup>
作者:Robert W. Murray、Megh Singh、Nigam Rath
DOI:10.1021/jo971339f
日期:1997.12.1
Hexamethylbenzene (1) reacts with dimethyldioxirane (2) via three separate reaction pathways. In the major pathway the reaction proceeds through an arene oxide which is rapidly transformed to the oxepin valence tautomer. In the first example of the reaction of an oxepin with 2 the oxepin is oxidized to first the cis-dioxide and then to the trioxide with the third oxide trans to the other two oxide rings. In a second competing pathway a methyl group migrates in the first-produced arene oxide to give a hexamethyl-cyclohexadienone. This material then reacts rapidly with 2 to give a trans-diepoxide. The third reaction pathway involves the C-H insertion reaction of 2. This process gives first the derived benzyl alcohol and then the corresponding benzoic acid. Two other minor products are also formed, one is rationalized as arising from reaction of the arene oxide with water. The other is a tricyclic compound of unknown origin.
Reaction of Hexamethylbenzene with Dimethyldioxirane<sup>1</sup>