“…Next, A adds to aryl alkyne 2 providing vinyl radical B , which reacts with dioxygen to give peroxy radical C . As suggested in analogous processes, complex , radicals like C can convert to alkoxy radicals E , probably via “dimeric” intermediates D , which undergo homolytic cleavage of the central O–O bond. If E abstracts a hydrogen from THF, , enol F is formed, which tautomerizes to give product 3 .…”