𝔖 Bobbio Scriptorium
✦   LIBER   ✦

1H NMR investigations on the conformation of the spirodioxolanes derived from vicinal diols. II—The ketal of cyclohexanone and racemic 1,2-propanediol

✍ Scribed by C. Csunderlik; T. Chirilǎ; R. Bacaloglu

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
314 KB
Volume
18
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The methylene, methine and methyl protons at C‐2 and C‐3 from the dioxolane moiety in 2‐methyl‐1,4‐dioxaspiro[4.5]decane constitute an ABMX~3~ coupling system. The analysis data obtained and, also, the application of the Karplus rule to the value of the J(AB) vicinal coupling constant, confirm the axial orientation of the A methine proton and the pseudoequatorial orientation of the B methylene proton. These findings agree with a ‘half‐chair’ conformation of the 1,3‐dioxolane ring.

📜 SIMILAR VOLUMES

A NMR investigation of proline and its d
A NMR investigation of proline and its derivatives. II—Conformational implications of the 1H NMR spectrum of L-proline at different pH
✍ L. Pogliani; M. Ellenberger; J. Valat 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 855 KB

## Abstract The 250 MHz ^1^H NMR spectrum of L‐proline is comprehensively analysed by computer simulation for different pH values. A fast __endo__–__exo__ interconversion has already been proposed from chemical shift and coupling constant data. A critical comparison of the vicinal coupling constant

Investigation of benzimidazoles: II—the
Investigation of benzimidazoles: II—the influence of substituents and solvents on the 1H and 13C NMR chemical shifts of 2-substituted 1,3-dimethylbenzimidazolium perchlorates
✍ L. I. Larina; T. I. Vakul'skaya; A. V. Filatov; B. I. Istomin; E. F. Shibanova; 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 356 KB 👁 1 views

## Abstract The influence of substituents on ^1^H and ^13^C NMR chemical shifts of 2‐substituted 1,3‐dimethylbenzimidazolium perchlorates in different solvents has been investigated. It has been shown that the transmission of the electronic effects of the substituents in benzimidazoles and their qu

ID and 2D 1H NMR studies of iron(III) co
ID and 2D 1H NMR studies of iron(III) complexes on geoporphyrins of the deoxophylloerythroetio structural type derived from oil shale
✍ Stanisaw Wototwiec; Lechostaw Latos-Gražyński; Olga V. Serebrennikova; Francisze 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 869 KB

## Abstract One‐ and two‐dimensional ^1^H NMR studies of low‐spin iron(III) geoporphyrins derived from the deoxophylloery‐throetioporphyrin series (the oil shale source) resulted in an unambiguous assignment of all resonances. Deoxophylloerythroetioporphyrin (DPEP) and its 17‐desethyl homologue wer

The conformation of t-butyl 2-methoxy-5,
The conformation of t-butyl 2-methoxy-5, 6-dihydro-2 H-pyran-6-carboxylates and 6,6′- disubstituted 2-methoxy-5,6-dihydro-2H-pyran derivatives on the basis of 1H and 13 C NMR spectra
✍ Marek Chmielewski; Janusz Jurczak; Aleksander Zamojski; Halina Adamowicz 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 474 KB

## Abstract The ^1^H and ^13^C NMR spectra of __trans__‐ and __cis__‐__tert__‐butyl 2‐methoxy‐5,6‐dihydro‐2__H__‐pyran‐6‐carboxylates (1 and 2) and 6,6′‐disubstituted 2‐methoxy‐5,6‐dihydro‐2__H__‐pyrans (3‐7) have been recorded. HH and CH coupling constants are discussed in terms of the ^1^H~6~⇄^6^