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- W2734303604 abstract "A series of 6-substituted-1,3-diphenyl-1H-pyrazolo[3,4-b]quinoxalines were prepared using a new synthetic pathway: reductive cyclization of appropriate 5-(o-nitrophenyl)-pyrazoles with ferrous oxalate or triphenylphosphine. The main advantage of this procedure is that, contrary to the older protocols of pyrazolo[3,4-b]quinoxaline synthesis, this method allows for a substituent to be introduced to the carbocyclic ring without the formation of isomers. The pyrazole ring can also be modified to some extent. Furthermore, we propose a new mechanism for the oldest reported pyrazolo[3,4-b]quinoxaline synthesis, based on the condensation between o-phenylenediamine and 3,4-pyrazolin-5-diones." @default.
- W2734303604 created "2017-07-14" @default.
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- W2734303604 date "2017-08-01" @default.
- W2734303604 modified "2023-09-27" @default.
- W2734303604 title "A new regiospecific synthesis method of 1 H -pyrazolo[3,4- b ]quinoxalines – Potential materials for organic optoelectronic devices, and a revision of an old scheme" @default.
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- W2734303604 doi "https://doi.org/10.1016/j.tet.2017.06.061" @default.
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