Additivity scheme in nmr chemical shifts of disubstituted pyridines

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An additivity relationship for chemical shifts similar to that found in the literature for coupling constants has been tested in eleven disubstituted pyridines. The chemical shifts of these disubstituted pyridines were measured in different solvents at different concentrations and extrapolated to in...

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Autor principal: Contreras, Rubén Horacio
Publicado: 1974
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222860_v23_n2_p209_Contreras
http://hdl.handle.net/20.500.12110/paper_00222860_v23_n2_p209_Contreras
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00222860_v23_n2_p209_Contreras
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spelling paper:paper_00222860_v23_n2_p209_Contreras2023-06-08T14:48:54Z Additivity scheme in nmr chemical shifts of disubstituted pyridines Contreras, Rubén Horacio An additivity relationship for chemical shifts similar to that found in the literature for coupling constants has been tested in eleven disubstituted pyridines. The chemical shifts of these disubstituted pyridines were measured in different solvents at different concentrations and extrapolated to infinite dilution. In order to compute the "effects" of the different substituents, the chemical shifts of the corresponding monosubstituted pyridines and of pyridine were measured in the same solvents at different concentrations. These chemical shifts were extrapolated to infinite dilution. In most cases it was found that the extrapolated chemical shifts for disubstituted pyridines are in good agreement with those calculated using the additivity relationship. Only in a few cases was it found that the additivity scheme does not hold. © 1974. Fil:Contreras, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1974 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222860_v23_n2_p209_Contreras http://hdl.handle.net/20.500.12110/paper_00222860_v23_n2_p209_Contreras
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description An additivity relationship for chemical shifts similar to that found in the literature for coupling constants has been tested in eleven disubstituted pyridines. The chemical shifts of these disubstituted pyridines were measured in different solvents at different concentrations and extrapolated to infinite dilution. In order to compute the "effects" of the different substituents, the chemical shifts of the corresponding monosubstituted pyridines and of pyridine were measured in the same solvents at different concentrations. These chemical shifts were extrapolated to infinite dilution. In most cases it was found that the extrapolated chemical shifts for disubstituted pyridines are in good agreement with those calculated using the additivity relationship. Only in a few cases was it found that the additivity scheme does not hold. © 1974.
author Contreras, Rubén Horacio
spellingShingle Contreras, Rubén Horacio
Additivity scheme in nmr chemical shifts of disubstituted pyridines
author_facet Contreras, Rubén Horacio
author_sort Contreras, Rubén Horacio
title Additivity scheme in nmr chemical shifts of disubstituted pyridines
title_short Additivity scheme in nmr chemical shifts of disubstituted pyridines
title_full Additivity scheme in nmr chemical shifts of disubstituted pyridines
title_fullStr Additivity scheme in nmr chemical shifts of disubstituted pyridines
title_full_unstemmed Additivity scheme in nmr chemical shifts of disubstituted pyridines
title_sort additivity scheme in nmr chemical shifts of disubstituted pyridines
publishDate 1974
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222860_v23_n2_p209_Contreras
http://hdl.handle.net/20.500.12110/paper_00222860_v23_n2_p209_Contreras
work_keys_str_mv AT contrerasrubenhoracio additivityschemeinnmrchemicalshiftsofdisubstitutedpyridines
_version_ 1768544307141148672

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