TY - JOUR A1 - Milyutin, Constantine V. A1 - Komogortsev, Andrey N. A1 - Lichitsky, Boris V. A1 - Melekhina, Valeriya G. T1 - A study of the photochemical behavior of terarylenes containing allomaltol and pyrazole fragments JF - Beilstein Journal of Organic Chemistry PY - 2022/// VL - 18 SP - 588 EP - 596 SN - 1860-5397 DO - 10.3762/bjoc.18.61 PB - Beilstein-Institut JA - Beilstein J. Org. Chem. UR - https://doi.org/10.3762/bjoc.18.61 KW - allomaltol KW - ESIPT process KW - photochemistry KW - pyrazoles KW - terarylenes N2 - The photochemical properties behavior of 3-hydroxy-4-pyranone containing terarylenes with a pyrazole bridge fragment were studied. It was shown that UV-induced 6π-electrocyclization of the 1,3,5-hexatriene system was not observed for the considered objects molecules. At the same time, the phototransformation of such systems proceeds exclusively in the direction of the contraction of the pyranone ring leading to unstable α-hydroxydiketones. For the first time the possibility of isolation of the resulting α-hydroxydiketones in pure form was demonstrated. Wherein, it was shown that relatively low stable α-hydroxydiketones can be trapped by reaction with 1,2-phenylenediamine. The general method for the preparation of the corresponding quinoxalines on the basis of the aforementioned condensation was implemented. It was demonstrated that the studied photoreaction does not depend on the type of pyrazole bridge. The structures of three of synthesized products were established by X-ray diffraction. ER -