Cu(I) cleavage of the perester to a Cu(II) species and t-butyloxy radical. Radical proton exchange between allylic position cyclohexene and tBuOH. Recombination of allyl radical with Copper acetate species forming a Cu(III) intermediate and finally pericyclicreductive elimination to product and regeneration of Cu(I).
In a recent mechanistic in-silico analysis the radical intermediates are skippped in favor of a direct reaction with pre-coordinated alkene and a RCOOCu(III)OR catalyst (Mayoral et al. DOI) Deployment: Mukaiyama Taxol total synthesis step 44 to 45 is a variation. Organic syntheses: OS 5:70