𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Carbon-13 NMR spectra of some epoxides derived from dicyclopentadiene

✍ Scribed by Yasuhiro Matoba; Takashi Kagayama; Yasutaka Ishii; Masaya Ogawa

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

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The ^13^C NMR spectra of a series of epoxides derived from endo‐ and exo‐dicyclopentadiene and their partially hydrogenated compounds were determined to examine the substituent effects arising from the introduction of the oxirane ring in comparison with those found in other ring systems. The ^13^C signals of some epoxides were assigned by using lanthanide shift reagents. Characteristic substituent effects exerted by an oxirane ring were demonstrated. Marked steric γ‐effects of −8—13 ppm were observed at the bridge carbon signal in the bicyclo[2.2.1]heptane skeleton. Differences were found in the substituent effects between endo‐ and exo‐dicyclopentadiene epoxides, and have been discussed in relation to the molecular geometry.

📜 SIMILAR VOLUMES

Carbon-13 NMR spectra of anthraquinone-d
Carbon-13 NMR spectra of anthraquinone-derived dyes
✍ I. B. Rubin; M. V. Buchanan 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 430 KB

## Abstract The ^13^C NMR spectra of six anthraquinone‐derived dyes, namely benzanthrone, 1‐(methylamino)anthraquinone, 1,4‐di‐p‐toluidinoanthraquinone, 1,4‐diamino‐2,3‐dihydroanthraquinone, 1,4‐diaminoanthraquinone and dibenzochrysenedione, have been measured. The chemical shift assignments were a

Carbon-13 NMR spectra of some labdane di
Carbon-13 NMR spectra of some labdane diterpenoids
✍ Amarendra Patra; Alok K. Mitra; Swapna Biswas; Chitra Das Gupta; Tapan K. Chatte 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 181 KB 👁 1 views

## Abstract Carbon‐13 signal assignments of the labdane diterpenoids phlogantholide‐A, its diacetate and isophlogantholide‐A are reported. The assignments of the ^13^C NMR signals of 14‐deoxyandrographolide and its diacetate, made earlier, have now been confirmed by lanthanide shift studies on the