Praseodymium(II1) tris(dipiva1omethanato) [Pr(DPM),] reduces the complex overlapping aromatic absorptions in the proton NMR spectrum of a monosubstituted naphthalene, cis-3-(1- naphthyl)-l,3,5,5-tetramethylcyclohexan-l-ol(l) to a virtually first-order pattern, whereas Eu(DPM), at the same and higher
Application of rank correlation to lanthanide induced shift data
β Scribed by Wai-Kee Li; Sik-Yum Lee
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 254 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
Spearman's rank correlation method is suggested as an alternative procedure for the treatment of lanthanide induced shift data. When this method is applied to Sullivan's data [J. Am. Chem. Soc. 98, 7162 (1976)], the results are similar to those obtained by the jackβknife and Kendall techniques, which were introduced in a previous article. All three methods are able to distinguish between closely related structures. Among these three nonβparametric methods, the Spearman procedure is probably the simplest.
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## Abstract Some available methods for the analysis of lanthanide induced shift data have been examined. These methods are compared and evaluated using the data gathered from substituted phenyl __tert__βbutyl carbinols.
## Abstract Lanthanide induced shifts using Yb(fod)~3~ and Pr(fod)~3~ were used for the signal assignments of the ^13^C spectra of the 1,4βbenzodiazepines diazepam, desmethyldiazepam, prazepam and flurazepam, and for characterizing their solution conformation with respect to the substituents at Nβ1
Anionic EDTA complexes of Pr(III) and Eu(II1) produce dowdeld and upfield shifts, respectively, of the NH resonances of amidinim ions, RC(NH2),+. These LnEDTA--induced shifts arise through the formation of weak ion pairs. Results for the acetamidininm ion show that H,, the high field NH, experiences