Naslov
Betainska struktura nekih pironilpirazola
(The betaine structure of some pyronylpyrazoles)

Autori
Brbot-Šaranović, Ana ; Katušin-Ražem, Branka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Sažeci XV. Hrvatskog skupa kemičara i kemijskih inženjera / Gojo, M. ; Trajkov, N. ; Smolec, S. - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 1997, 105-105

Skup
XV. Hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Opatija, Hrvatska, 24.03.1997. - 26.03.1997

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Betaini; Pironilpirazoli
(Betaine; Pyronylpyrazoles)

Sažetak
We have already reported the synthesis and structure of some pyronylpyrazoles.1 The structure of N, N-disubstituted derivatives of pyronylpyrazoles Are the subject of the present communication. The structure of compounds 1-6 can be described by a covalent resonance form (A) and a dipolar one (B) which presents the heterocyclic betaine structure. Heterocyclic betaines have been the subject of extensive investigation. 1-H and 13-C NMR data of compounds 1-6 are consistent with their dipolar nature (form B). The larger 1-J coupling constants (C-4, H and N-CH3) and pyrazole carbons chemical shift values are in agreement with those reported for pyrazolium salts and can be explained by increased electron deficiency of the pyrazole ring.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemija

POVEZANOST RADA