Conclusions
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1.
Electron-donor substituents in the p-positions of the aromatic rings in Schiff bases increase the overall addition rate of the benzoyl and trichloroacetyl isocyanates to Schiff bases and shift the reaction toward the formation of 4-membered rings, whereas electron-acceptor substituents shift the reaction toward the formation of oxidiazinone derivatives.
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2.
Highly polar solvents (dimethyl sulfoxide and SO2) promote the formation of hexahydro-S-triazine-dione derivatives.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2016–2020, September, 1972.
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Zobova, N.N., Rusanov, G.N. & Arbuzov, B.A. Reaction of isocyanates with schiff bases. Russ Chem Bull 21, 1957–1960 (1972). https://doi.org/10.1007/BF00854615
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DOI: https://doi.org/10.1007/BF00854615