Abstract
The nitrogen shieldings of covalent azides are shown to be essentially independent of molecular interactions in solutions of a large variety of solvents. They present a rare case where substituent effects, exerted by an aryl or alkyl group attached to the azide, clearly swpass the range of solvent induced effects on the nitrogen shieldings. This occurs in spite of the large net change splitting in the electronic structure of the azide group and the presence of lone pair electrons on this group. The observed induced range of solvent effects does not exceed 2 ppm in most cases which is similar to that previously observed for dinitrogen (N2) and an azo bridged structure.
Highlights
The nitogen NMR shieldinp of solutę molecules are very sensitive to both specific and non-specific moleculm intemctions on solution [1]
The nitogen shieldings of covalent azides are shorłryr to be essentially independent of molecular interactions in solutions of a large variety of solvents
They present a rare case rłłreresubstituent effects' exerted by an aryl or alĘl group attached to the azide, clearly surpass the range of solvęnt induced effects on the nifrogen shieldings
Summary
The nitogen NMR shieldinp (chemical shifu) of solutę molecules are very sensitive to both specific and non-specific moleculm intemctions on solution [1]. The urcxpectedly low sensitivity of the nifrogen NMR shieldings of covalent azides to solvent effects The nitogen shieldings of covalent azides are shorłryr to be essentially independent of molecular interactions in solutions of a large variety of solvents.
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