𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Oxygen-17 and carbon-13 NMR studies of diarylketenes

✍ Scribed by Giovanni Cerioni; Antonio Plumitallo; Joseph Frey; Zvi Rappoport

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
464 KB
Volume
33
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Natural abundance ^17^O and ^13^C NMR spectra for eleven diarylketenes are reported. ^17^O shifts show invariance with para substitution and a shielding due to ortho substitution. A buttressing effect is observed for bis(2,3,4,5,6‐pentamethylphenyl)ketene. A comparison between ketenes and isocyanates is made. The importance of cylindrical symmetry for half‐height linewidths is discussed.

📜 SIMILAR VOLUMES

Oxygen-17 NMR studies of N-nitrosamines
Oxygen-17 NMR studies of N-nitrosamines
✍ Giovanni Cerioni; Angelo G. Giumanini; Giancarlo Verardo; Hans Dahn 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 472 KB

## Abstract Natural abundance ^17^O NMR data for seven aliphatic, nine cyclic and thirteen aromatic __N__‐nitrosamines, recorded at room temperature in acetonitrile, are reported. Differences in chemical shifts among and within the three groups are discussed in terms of electronic and steric effect

Carbon-13 NMR of oxygenated derivatives
Carbon-13 NMR of oxygenated derivatives of polyoxyethylenes
✍ Michel Barrelle; Claude Béguin; Sylvie Tessier 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 249 KB

## Abstract The ^13^C NMR spectra of several oligo(oxyethylene) glycols and of their derivatives obtained from oxidative cleavage were studied. Assignments are proposed and the ^13^C chemical shifts recalculated from sets of parameters obtained for the substituents on the parent structure, CH~2~C

Carbon-13 NMR studies of naturally occur
Carbon-13 NMR studies of naturally occurring maytansinoids
✍ William A. Wallace; Albert T. Sneden 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 409 KB

## Abstract The ^13^C NMR spectra of the antileukemic ansa macrolide maytansine and eight naturally occurring homologues were recorded. Signals were assigned to specific carbon atoms of the ansa macrolide ring and C‐3 ester side chain using data from off‐resonance decoupling, single frequency decou

Carbon-13 NMR studies of a series of ben
Carbon-13 NMR studies of a series of benzylphenols
✍ Yoshimi Nakai; Fukiko Yamada 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 425 KB

## Abstract Carbon‐13 NMR spectra of a series of benzylphenols and their __O__‐alkylated derivatives were recorded to find the substituent effects of the benzyl, hydroxybenzyl and alkoxybenzyl groups on the ^13^C chemical shifts. It was found that the methylene bridge carbons show signal shifts mai

Carbon-13 NMR study of isoxazolopyridine
Carbon-13 NMR study of isoxazolopyridine systems
✍ Stefano Chimichi; Piero Tedeschi; Alfredo Camparini; Fabio Ponticelli 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 285 KB

## Abstract The ^13^C NMR spectra of all azabenzenoid isoxazolopyridines and some of their chloro derivatives are discussed. All ^13^C resonances were unambiguously assigned by means of gated decoupled spectra, from which one‐bond and long‐range ^13^C^1^H coupling constants have been determined fr