Communications

Photoacid generation from substituted benzo[b]thiophene-2-carboxanilides

L. G. Samsonova^a, N. V. Izmailova^a, R. M. Gadirov^a, R. A. Irgashev^b, N. A. Kazin^b, Yu. A. Kvashnin^b, A. S. Steparuk^b, G. L. Rusinov^b, E. V. Verbitskiy<sup>bc

a</sup> Tomsk State University of Control Systems and Radioelectronics, 634021 Tomsk, Russian Federation
^b I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 620137 Ekaterinburg, Russian Federation
^c Ural Federal University, 620002 Ekaterinburg, Russian Federation

Abstract: The photolysis of 3-chloro- and 3-sulfonato-substituted benzo[b]thiophene-2-carboxanilides was explored using 3^rd harmonic Nd-YAG laser radiation (355 nm) in toluene. The acid production was monitored by the formation of the protonated form of 4,6-bis[5-(9-ethyl-9H-carbazol-3-yl)thiophen-2-yl]pyrimidine serving as an indicator. The quantum yield of the acid produced had the order of 10^–2 and depended on the structural characteristics of the molecules involved.

Keywords: photochemical acid generator, 6p-electron photocyclization, benzo[b]thiophene-2-carboxanilides, phototransformation, acid–base indicator.

Received: 16.05.2025
Accepted: 19.08.2025

Language: English

DOI: 10.71267/mencom.7828

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