Photocatalytic Synthesis of Acetals and Ketals from Aldehydes and Silylenolethers without the Use of Acids

Abstract

What is the most significant result of this study?A new photocatalytic method for the acetalization and ketalization of aldehydes and silylenolethers was developed that uses only a biscyanolated perylene bisimide as photocatalyst in substoichiometric amounts and green light from LEDs. The tolerance of functional groups is remarkably high; in particular, acid-labile Boc groups are tolerated. This is due to the fact that the method does not require the use of any acids, photoacids or H-atom transfer reagents as additives.

Symmetric dicyanobenzothiadiazole (DCBT) dyes with a 1.5 eV excited state reduction potential range

“…Strong photooxidants are of interest in multiple elds such as sustainable synthetic chemistry [1][2][3][4][5][6][7][8][9] and solar-to-fuel generation. [10][11][12][13][14][15][16][17][18] In these systems, a strong photooxidant is oen used to create greater driving forces in order to achieve higher efficiencies and to access new reactions.…”