𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Further evidence of the intrinsic chemical shift non-equivalence

✍ Scribed by Janusz Dąbrowski; Andrzej Ejchart; Władysław Biernacki

Publisher
John Wiley and Sons
Year
1970
Tongue
English
Weight
190 KB
Volume
2
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The influence of hydrogen bonds on the chemical shift non‐equivalence of geminal methyl groups in recently investigated carbinols has been eliminated by using the formyl derivatives of the general formula RCH(OCHO)C(NO~2~)Me~2~. The observed increasing non‐equivalence, with the rise of temperature, provides more convincing evidence of the intrinsic non‐equivalence.

📜 SIMILAR VOLUMES

New evidence of the intrinsic chemical s
New evidence of the intrinsic chemical shift non-equivalence
✍ Janusz Dabrowski; Andrzej Ejchart; Władysław Biernacki 📂 Article 📅 1970 🏛 John Wiley and Sons 🌐 English ⚖ 268 KB

## Abstract Carbinols of the general formulae R·CHOH·C(NO~2~)Me~2~ exhibit increasing values of chemical shift non‐equivalence for the geminal methyl groups with rise of temperature. This phenomenon furnishes indirect evidence for the intrinsic non‐equivalence.

13C chemical shift non-equivalence in me
13C chemical shift non-equivalence in methylene carbons of monosubstituted cyclohexanes
✍ Hiroshi Ito; Alfred F. Renaldo; Robert D. Johnson; Mitsuru Ueda 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 361 KB

Monosubstituted cyclohexanes were synthesized by addition of a cyclohexyl radical to olefins bearing different substituents at the a-position. Six distinct methylene "C resonances were observed, indicating that the methylene carbons located at the 2 and 6 positions and at the 3 and 5 positions are n

Chemical shift non-equivalence of ring p
Chemical shift non-equivalence of ring protons in N-substituted β-lactams
✍ A. Vigevani; B. Gioia; G. G. Gallo 📂 Article 📅 1970 🏛 John Wiley and Sons 🌐 English ⚖ 216 KB

## Abstract A study is reported on the chemical shift non‐equivalence of the diastereotopic protons at C‐4 in identically 3,3‐disubstituted β‐lactams having an asymmetric carbon atom in positions ranging from β to ε of the chain attached to the nitrogen atom. The non‐equivalence has been correlated

Chemical shift non-equivalence of methyl
Chemical shift non-equivalence of methylene protons adjacent to an asymmetric nitrogen atom
✍ A. Vigevani; B. Gioia; B. Cavalleri; G. G. Gallo 📂 Article 📅 1971 🏛 John Wiley and Sons 🌐 English ⚖ 286 KB

## Abstract The chemical shift non‐equivalence of the methylene protons adjacent to the quaternary nitrogen in compounds of the type has been investigated. The behaviour of the examined compounds is interpreted in terms of different rotation rates around the three CN^⊕^ bonds. The vicinal and gem

Solvent effect on chemical shift non-equ
Solvent effect on chemical shift non-equivalence of methylene protons in dibenzyl-, diphenacyl- and benzyl phenacyl sulphoxides
✍ Ishai Sataty 📂 Article 📅 1971 🏛 John Wiley and Sons 🌐 English ⚖ 263 KB

The methylene protons of dibenzyl sulphoxide are magnetically equivalent in low dielectric and non-equivalent in high dielectric constant solvents, while for diphenacyl sulphoxide this behaviour is reversed. In both cases, the variation in the magnitude of the non-equivalence reflects a greater down