𝔖 Bobbio Scriptorium
✦   LIBER   ✦

1H and 13C NMR studies of some aromatic dilactones (precursors of paracyclophanes)

✍ Scribed by Arlette Solladié-Cavallo; Marcel Hilbert

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
379 KB
Volume
17
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Carbon‐13 and proton NMR data of macrocyclic diaromatic dilactones are presented. The observed behaviour of the spectra as a function of temperature shows that the energy barrier for the re‐orientation of the side chains is lower than 49 kJ mol^−1^ (12 kcal mol^−1^) and that the energy barrier for the rotation of the aromatic rings is larger than 99 kJ mol^−1^ (24 kcal mol^−1^). Hence, chiral substituted dilactones of this type will be resolvable, and the enantiomers can be easily handled at room temperature.

📜 SIMILAR VOLUMES

1H and 13C NMR studies of two monosubsti
1H and 13C NMR studies of two monosubstituted [2.2]paracyclophanes
✍ Arlette Solladié-Cavallo; Marcel Hibert 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 252 KB

## Abstract 250 MHz ^1^H NMR of two monosubstituted [2.2]paracyclophanes shows that whether the substituent is an electron releasing group, OMe, or a withdrawing group, CO~2~Me, the transannular effect is deshielding. 62.86 MHz ^13^C NMR shows that among the six transannular effects, only one has a

1H and 13C NMR Studies of Some Anthraqui
1H and 13C NMR Studies of Some Anthraquinones and Anthracenetetrones
✍ K. Danielsen; G. W. Francis; D. W. Aksnes 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 297 KB 👁 2 views

H and lSC NMR chemical shifts are reported and assigned for 1,4,9,10-and 2,3,9,1 O-anthracenetetrone. In addition, NMR data are given for 2,3-dihydroxy-9, 1 O-anthraquinone, 2.3-dimethoxy-9.10anthraquinone and 1 -hydroxy-2-acetoxy-9,l O-anthraquinone, encountered during the preparation of the anthra

1H and 13C NMR study of some polychlorob
1H and 13C NMR study of some polychlorobuta-1,3-diene derivatives
✍ D. Botta; E. Mantica; L. Castellani; G. Dotelli; L. Zetta 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 110 KB 👁 1 views

Because of the upsurge of interest in polychlorobuta-1,3-diene derivatives as uncommon contaminants in underground water, seven congeners, the three pentachloro-and four tetrachloro-[(Z)-and (E)-1,1,3,4tetrachloro-, 1,1,4,4-tetrachloro-and (Z,Z)-1,2,3,4-tetrachloro]buta-1,3-dienes, were synthesized

A 13C and 1H NMR study of some aryltellu
A 13C and 1H NMR study of some aryltellurium tris(diethyldithiocarbamates)
✍ Mohammad A. Khadim; Vijay Kumar; Peter H. Bird; Bhuvan C. Pant; Lawrence D. Cole 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 347 KB

## Abstract Carbon‐13 and proton NMR spectra are reported for phenyl‐,4‐methoxyphenyl‐, 4‐ethoxyphenyl‐ and 3‐methyl‐4‐methoxyphenyltellurium tris(diethyldithiocarbamate). Both the ^1^H and the ^13^C spectra are typical of compounds undergoing a fast exchange process, only the __N__‐methylene proto