𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The relationship between proton-proton NMR coupling constants and substituent electronegativities—I : An empirical generalization of the karplus equation

✍ Scribed by C.A.G. Haasnoot; F.A.A.M. de Leeuw; C. Altona

Publisher
Elsevier Science
Year
1980
Tongue
French
Weight
937 KB
Volume
36
Category
Article
ISSN
0040-4020

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Relationship between proton—proton NMR c
Relationship between proton—proton NMR coupling constants and substituent electronegativities. IV—An extended karplus equation accounting for interactions between substituents and its application to coupling constant data calculated by the Extended Hückel method
✍ Lambertus A. Donders; Franciscus A. A. M. De Leeuw; Cornelis Altona 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 797 KB

Some well known Karplus equations are discussed and their shortcomings are indicated. To remedy the problems associated with the experimentally observed non-additive substituent effects on vicinal protowproton coupling constants, an extension given recently is discussed; this accounts for pairwise i

Conformational studies on pyranoid sugar
Conformational studies on pyranoid sugar derivatives by NMR spectroscopy. Correlations of observed proton—proton coupling constants with the generalized Karplus equation
✍ Philippe L. Durette; Derek Horton 📂 Article 📅 1971 🏛 John Wiley and Sons 🌐 English ⚖ 675 KB

## Abstract Proton spin‐spin coupling values measured for a wide range of tetrasubstituted tetrahydropyran ring‐systems obtained from aldopentopyranose sugars have been correlated with values calculated from a generalized version of the Karplus equation which takes into account the electronegativit

Correlations between molecular parameter
Correlations between molecular parameters and the spin–spin coupling constants of vicinal protons: Criticism of the karplus equations
✍ L. G. Vorontsova; A. F. Bochkov 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 382 KB

## Abstract Conformationally rigid systems such as xylopyranose 1,2,4‐ortho esters (**1a**) and (**1b**) and 10‐methoxy‐6‐aza‐isoadamantane (**2**), for which the identity of conformations both in the crystalline state and in solution can reasonably be assumed, provide good models for the study of

Empirical group electronegativities for
Empirical group electronegativities for vicinal NMR proton–proton couplings along a CC bond: Solvent effects and reparameterization of the Haasnoot equation
✍ Cornelis Altona; Robert Francke; Rudy de Haan; Johannes H. Ippel; Godefridus J. 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 891 KB

## Abstract Empirical group electronegativities (substituent parameters λ~__i__~), valid for ^3^__J__(HH) in saturated HCCH fragments, were derived from the coupling to methyl in substituted ethanes and isopropyl derivatives according to the equation In contrast to earlier work, it was found ad