Chemistry of Heterocyclic Compounds p. 801 - 807 (1990)
Update date:2022-07-29
Topics:
Oleinik, I. V.
Zagulyaeva, O. A.
Denisov, A. Yu.
Mamaev, V. P.
It was demonstrated by UV and 13C NMR spectroscopy that in concentrated sulfuric acid ylidene derivatives of dihydropyridine (Ia) and dihydropyridazine (IIa) have aromatic structures Ib and IIb, while derivatives of dihydropyrimidines IIIa and IVa, dihydr
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