C-13 NMR SPECTRAL CHARACTERIZATION OF 4-ARYL-SUBSTITUTED BISPYRAZOLO[3,4-B-4'3'-E]PYRIDINES

Authors
KOLEHMAINEN E LAIHIA K RASALA D PUCHALA A
Citation
E. Kolehmainen et al., C-13 NMR SPECTRAL CHARACTERIZATION OF 4-ARYL-SUBSTITUTED BISPYRAZOLO[3,4-B-4'3'-E]PYRIDINES, Magnetic resonance in chemistry, 34(7), 1996, pp. 570-571
Citations number
8
Categorie Soggetti
Spectroscopy,Chemistry
Journal title
Magnetic resonance in chemistry → ACNP
ISSN journal
07491581
Volume
34
Issue
7
Year of publication
1996
Pages
570 - 571
Database
ISI
SICI code
0749-1581(1996)34:7<570:CNSCO4>2.0.ZU;2-V
Abstract
The C-13 NMR chemical shifts for a series of l-1,7-diphenylbispyrazolo [3,4-b;4',3'-e]pyridines, where aryl=4'-R-phenyl [R=H (1), CH3 (2), OC H3 (3), N(CH3)(2) (4), F (5), CI (6), Br (7), CF3 (8), NO2 (9) and CN (10)], 2'-Br-phenyl (11) and 4'-pyridyl (12), were determined. The spe ctral assignments are based on the empirical substituent-induced chemi cal shifts (SCS), on the 2D C-13-H-1 HETCOR correlations transmitted v ia (1)J(C, H) couplings and in case of 4'-CN substituted derivative (1 0) on an inverse 2D H-1-C-13 HMBC measurement.