2-polyfluoroalkylchromones 12. Nitration of 5,7-dimethyl-2-polyhaloalkylchromones and complete assignment of signals in the H-1 and C-13 NMR spectra of 5,7-dimethyl-2-trifluromethylchromone and its mono- and dinitro derivatives / Sosnovskikh VY,Usachev BI,Kodess MI // RUSSIAN CHEMICAL BULLETIN. - 2002. - V. 51, l. 10. - P. 1817-1828.

ISSN/EISSN:

1066-5285 / нет данных

Type:

Article

Abstract:

The nitration of 5,7-dimethyl-2-polyhaloalkylchromones affords either 5,7-dimethyl-6-nitro- or 5,7-dimethyl-6,8-dinitro-2-polyhaloalkylchromones, depending on the reaction conditions. Signals in the H-1 and C-13 NMR spectra of the sterically hindered chromones were completely assigned using the 2D NOESY, HETCOR, and COLOC spectra. The influence of nonplanar nitro groups on chemical shifts of carbon atoms was studied. Some spectral peculiarities of the peri-methyl group were revealed. The H-1-H-1 and C-13-H-1 spin-spin coupling constants, including the extreme six-bond long-range coupling between the protons of the Me(5) group and H(8), were determined.

Author keywords:

2-polyhaloalkylchroman-4-ones; 2-polyhaloalkylchromones; nitration; H-1 and C-13 NMR spectroscopy; spin-spin coupling constants; increments of substituent chemical shifts; peri-methyl group; stericall MAGNETIC-RESONANCE SPECTROSCOPY; COUPLING-CONSTANTS; CHEMICAL-SHIFTS; FLAVONE

DOI:

10.1023/A:1021340132279

Web of Science ID:

ISI:000180430000006

Соавторы в МНС:

Другие поля

Поле	Значение
Month	OCT
Publisher	CONSULTANTS BUREAU
Address	233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
Keywords-Plus	MAGNETIC-RESONANCE SPECTROSCOPY; COUPLING-CONSTANTS; CHEMICAL-SHIFTS; FLAVONE
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Multidisciplinary
Number-of-Cited-References	38
Usage-Count-Since-2013	2
Journal-ISO	Russ. Chem. Bull.
Doc-Delivery-Number	635ZL