Chemistry of Heterocyclic Compounds p. 621 - 631 (1989)
Update date:2022-09-26
Topics:
Kirpicheok, M. A.
Gorozhankin, S. K.
Yufit, D. S.
Struchkov, Yu. T.
Kurapov, P. B.
Grandberg, I. I.
Stable 2,7-diaminobenzopyrylium tetrafluoroborates were obtained by the successive treatment of 7-diethylaminocoumarin, 4-methyl-7-diethylaminocoumarin, and 9-methyl-1H,5H-quinolizino<9,9a,1-gh>coumarin with triethyloxonium tetrafluoroborate and amines, v
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