| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5228209 | Tetrahedron | 2007 | 4 Pages |
Abstract
Partially saturated pyrazoles, namely 1-(4-substituted)phenyl-3-methoxycarbonyl-5-ethoxycarbonyl-4,5-dihydropyrazoles, were submitted to extensive 15N NMR spectroscopic analyses, performed in natural abundance. Nitrogen chemical shifts were measured by means of INEPT and HMBC experiments, while long range proton-nitrogen scalar coupling values were taken through J-HMBC experiments. A linear plot between nitrogen chemical shifts and Hammett Ïp was observed, enabling us to relate quantitatively the observed chemical shifts to the electronic features of the substituent in the 1-position of the 4,5-dihydropyrazole ring.
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Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Lara De Benassuti, Teresa Recca, Giorgio Molteni,