p-Selective (sp2)-C-H functionalization of electron rich arenes have been achieved for acylation and alkylation reaction, respectively, with acyl/alkylselenides by organic photoredox catalysis involving interesting mechanistic pathway.
<i>p</i>-Silylation of Arenes via Organic Photoredox Catalysis: Use of <i>p</i>-Silylated Arenes for Exclusive <i>o</i>-Silylation, <i>o</i>-Acylation, and <i>o</i>-Alkylation Reactions
Photocatalytic regiospecific p-silylation of arenes has been achieved by the coupling of in situ generated silyl radical with areneradicalcation. The strategy involves reductive activation of PhSe–SiR3 and single electron transfer from the electron rich arene to 9,10-dimethoxyanthracene radicalcation (DMA•+). p-Silyl arenes, thus formed, are further utilized for exclusive o-silylation reaction and
photoinduced decarboxylative C-Se bond-forming reaction employing alkyl N-hydroxyphthalimide esters as alkylation reagents and acid red 94 as an inexpensive photocatalyst has been documented. A broad range of alkyl N-hydroxyphthalimide esters were tolerated for this decarboxylation process, providing a series of unsymmetrical monoselenides with good to excellent yields. The mild conditions and the excellent