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Název: | Synthesis of highly symmetric mesomeric triazaphenalene betaines | ||||||||||
Autor: | Kafka, Stanislav; Larissegger-Schnell, B.; Kappe, T. | ||||||||||
Typ dokumentu: | Recenzovaný odborný článek (English) | ||||||||||
Zdrojový dok.: | Journal of Heterocyclic Chemistry. 2004, vol. 41, issue 5, p. 717-721 | ||||||||||
ISSN: | 0022-152X (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1002/jhet.5570410511 | ||||||||||
Abstrakt: | The synthesis of seven mesomeric triazaphenalene betaines I by condensation of hexahydro-2H-pyrimido[1,2-a]pyrimidine II with diethyl malonates or with bis(2,4,6-trichlorophenyl) malonates has been achieved. The guanidine II forms in benzene solution a salt with trimethyl methanetricarboxylate, which upon heating produces unsubstituted betaine I. | ||||||||||
Plný text: | https://onlinelibrary.wiley.com/doi/abs/10.1002/jhet.5570410511 | ||||||||||
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