132288-07-4Relevant academic research and scientific papers
CHEMICAL PROPERTIES OF YLIDENE DERIVATIVES OF AZINES. 4. STRUCTURES OF THE PRODUCTS OF PROTONATION AND TRANSFORMATION OF DIHYDROAZINYLIDENECYANOACETIC ESTERS IN CONCENTRATED SULFURIC ACID
Oleinik, I. V.,Zagulyaeva, O. A.,Denisov, A. Yu.,Mamaev, V. P.
, p. 801 - 807 (1990)
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
