𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Carbon-13 nuclear magnetic resonance spectra of some methyl and phenyl substituted 2H-azirines

✍ Scribed by Kazuaki Isomura; Hiroshi Taniguchi; Masaaki Mishima; Mizue Fujio; Yuho Tsuno

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
340 KB
Volume
9
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Carbon‐13 n.m.r. spectra have been obtained for some methyl and phenyl substituted 2__H__‐azirines. The higher field resonance of C‐2 than that of the corresponding aziridine carbon is interpreted in terms of ring strain. Substituent effects on the chemical shifts of the azirine ring carbons are discussed. A set of additivity parameters for the methyl and phenyl groups are obtained which can be used for the calculation of the chemical shifts of the azirine ring carbons. The substituent effect of an azirine ring on the chemical shift of benzene is also discussed in comparison with those of some other substituents. A high degree of s character (48.5%) in the exocyclic orbital of C‐3 is indicated by a large J(^13^C‐3,H) value (242.5 Hz).

📜 SIMILAR VOLUMES

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of some 2-substituted tetrahydropyrans
✍ A. J. de Hoog 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 314 KB

## Abstract Fourier transform carbon‐13 nuclear magnetic resonance spectra have been obtained and interpreted for some 2‐substituted tetrahydropyrans. The effects of the substituents on α, β, γ and δ‐carbon atoms are discussed. Using suitable reference compounds the γ‐parameter can be used for quan

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of methyl 2-pyronecarboxylates
✍ Takeshi Imagawa; Akira Haneda; Mituyosi Kawanisi 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 393 KB

## Abstract The ^13^C NMR spectra of methyl 2‐pyrone‐3‐, 4‐, 5‐ and 6‐carboxylates were studied and the substituent effects on the 2‐pyrone ring were compared with those of some model compounds. ^1^H NMR spectra were also recorded and discussed. The long range ^13^C, ^1^H coupling constants were ob

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of some heterocyclic D-homoandrostanes
✍ Deanna Marcano; Jeannette De Méndez; Ana C. Ortiz; Mirna Salinas 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 277 KB 👁 1 views

REFERENCE DATA causes the electron density to be comparatively lower at C-3 and C-5 than at C-2 and C-4, so that the former signals resonate at lower fields. Distinction between the signals of the C-2/C-4 and C-3/C-5 pairs was achieved by comparing the C-H coupling patterns of 5 and 1. Compounds 1,

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of veratrine components
✍ Deanna de Marcano; Bernardo Méndez; Henry Parada; Aníbal Rojas 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 114 KB 👁 1 views

## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of veratridine and cevadine.

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of ceveratrum alkaloids
✍ Francis A. Carey; William C. Hutton; James C. Schmidt 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 402 KB

## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of the alkamines veracevine, germine and zygacine derived from steroidal alkaloids of the ceveratrum class. Assignment of signals was aided by analysis of the partially relaxed spectrum of cervagenine 9,12