𝔖 Bobbio Scriptorium
✦   LIBER   ✦

NMR spectroscopic characterization of ZE isomers of cyclododeca-1,5,9-triene

✍ Scribed by Reiner Radeglia; Helmut Poleschner; GÜNter Haufe

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
228 KB
Volume
31
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The four Z____E isomers of cyclododeca‐1,5,9‐triene were examined by ^13^C NMR spectroscopy. The vicinal ^1^H^1^H coupling constants of the olefinic protons were used to determine the stereochemistry at the double bonds. For the symmetrically substituted CHCH fragments (chemically equivalent H atoms) this parameter was obtained from the ^13^C NMR multiplets which are observed in ^1^H continuous‐wave off‐resonance ^13^C NMR experiments. The precise assignment of the ^1^H and ^13^C chemical shifts, in particular for the Z,Z,E and Z,E,E isomers, was possible on the basis of off‐resonance measurements in combination with ^13^C/^1^H heteronuclear correlated and ^1^H/^1^H‐COSY‐45 2D experiments.

📜 SIMILAR VOLUMES

Synthesis of [14C6-3,4,7,8,11,12]-(1E,5E
Synthesis of [14C6-3,4,7,8,11,12]-(1E,5E,9E)-cyclododeca-1,5,9-triene
✍ Bruce N. Diel; Mingcheng Han; Jonathan M. White 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 French ⚖ 87 KB 👁 1 views

## Abstract Trimerization of butadiene in the presence of Ni(0) affords (1__E__,5__E__,9__E__)‐cyclododeca‐1,5,9‐triene **1** (__ttt__‐CDT), (1__E__,5__E__,9__Z__)‐cyclododeca‐1,5,9‐triene **2** (__ttc__‐CDT), and other isomers/oligomers. After optimization of reaction conditions, [^14^C~6~‐3,4,7,8

Characterization of a conformationally f
Characterization of a conformationally flexible system: NMR spectroscopic study of 1,5-diphenylpentane-2,4-dione
✍ Juha T. Pulkkinen; Reino Laatikainen; Jouko J. Vepsäläinen; Markku J. Ahlgrén 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 171 KB

Conformational Ñexibility of the keto and enol tautomers of 1,5-diphenylpentane-2,4-dione was characterized using the solvent and temperature dependence of the spinÈspin coupling constants, after the conformational space of the keto form had been mapped with molecular mechanical grid search calculat

NMR Characterization of Carbazole-Substi
NMR Characterization of Carbazole-Substituted Norbornene Comonomer 9-(Bicyclo[2.2.1.]hept-5-en-2-ylmethyl)-9H-carbazole (BHMCZ) and Poly(ethylene-co-BHMCZ) Copolymer
✍ Ilpo Mustonen; Terttu Hukka; Tuula T. Pakkanen 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 183 KB

## Abstract Carbazole‐substituted norbornene comonomer 9‐(bicyclo[2.2.1.]hept‐5‐en‐2‐ylmethyl)‐9__H__‐carbazole (BHMCZ) can be copolymerized with ethylene using the [Ph~2~C(Ind)(Cp)ZrCl~2~] catalyst and methylaluminoxane (MAO) cocatalyst system. The microstructures of BHMCZ comonomer and of ethylen

1H, 13C and 15N NMR spectroscopic charac
1H, 13C and 15N NMR spectroscopic characterization of unexpected degradation products of the nifedipine analogue bis(2-cyanoethyl) 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydro-3,5-pyridinedicarboxylate
✍ Edith Gössnitzer; Klaus Görlitzer; Hans J. Baltrusch 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 108 KB

## Abstract In the course of saponification experiments with bis(2‐cyanoethyl) 2,6‐dimethyl‐4‐(2‐nitrophenyl)‐1,4‐dihydro‐3,5‐pyridinedicarboxylate (**1**), an analogue of the calcium channel blocker nifedipine, three unexpected degradation products were isolated. The compounds were identified as 3