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13C,13C coupling constants from a mixture of isotopomers (13C) of substituted aromatic compounds; 1-nitronaphthalenes

โœ Scribed by Poul Erik Hansen; Jean-Pierre Albrand


Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
198 KB
Volume
17
Category
Article
ISSN
0749-1581

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โœฆ Synopsis


Abstract

^13^C Homonuclear decoupling experiments led to the assignment of the carbonโ€carbon coupling constants of ^13^Cโ€enriched 1โ€nitronaphthalene obtained by nitration of [1โ€^13^C]naphthalene. The effects of substituents on coupling constants can be explained on the basis of the electronegativity of the first atom of the substituent, and the observed substituent effects are shown to be parallel to previous data for oxygen containing substituents.


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## Abstract Coupling constants, ^1^__J__(^13^C,^13^C), of compounds containing a CF~3~ group are reported. The values for the coupling of the CF~3~ carbon with the neighbouring carbon are exceptionally large. In a series of compounds in which the CF~3~ group is bonded to an sp^3^, sp^2^ or sp carbo