The photochemical reactions of indoline-2-thiones in the presence of amines have been examined. Irradiation of indoline-2-thiones 1 in the presence of triethylamine yielded the desulphurization products, indolines 2, along with N,N-diethylthioacetamide 3. The photodesulphurization reactions of indoline-2-thiones 1 can be explained by a sequential electron/proton-transfer mechanism from the amine to the excited indoline-2-thione.
T. Nishio, N. Okuda and C. Kashima, J. Chem. Soc., Perkin Trans. 1, 1991, 141 DOI: 10.1039/P19910000141
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