Reactivity of 5,6-Dihydro-5-hydroxythymid-6-yl Generated via Photoinduced Single Electron Transfer and the Role of Cyclohexa-1,4-diene in the Photodeoxygenation Process
A designed N,N′-dialkyldiketopiperazine (DKP) provides evidence for the role of DKP additives as initiators that act by electron transfer in base-induced homolytic aromatic substitution reactions, involving coupling of haloarenes to arenes.
In the presence of two molar equiv. of B(C6F5)3p-benzoquinone reacts with persistent radicals TEMPO, trityl or decamethylferrocene by single electron transfer to give the doubly O-borylated benzosemiquinone radical anion with TEMPO+, trityl cation or ferrocenium counter cations.