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Proximity effects on the nuclear magnetic shielding tensor: Part 1. An ab initio study of 17O and 19F chemical shifts in the proximity of a methyl group

✍ Scribed by Julio C. Facelli; Ruben H. Contreras; Maria F. Tufró


Book ID
113257809
Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
485 KB
Volume
281
Category
Article
ISSN
0166-1280

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✍ Rubén H. Contreras; Rodolfo R. Biekofsky; Angel L. Esteban; Ernesto Diez; Jesus 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 547 KB

The effect of a cis-N-methyl group on the carbonyl 1 7 0 chemical shift, cis-MSCS, was investigated both from theoretical and experimental points of view in ten amide derivatives. Experimentally, it was observed that the cis-MSCS in N-methylformamide (2) corresponds to a shielding effect of 12.0 ppm