𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Dicondensed indolinobenzospiropyrans as precursors of thermo- and photochromic spiropyrans. Part II: assignment of 1H and 13C NMR spectra

✍ Scribed by Sam-Rok Keum; Su-Mi Ahn; Se-Jung Roh; Su-Jin Park; Sung-Hoon Kim; Kwangnak Koh

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
106 KB
Volume
44
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The ^1^H and ^13^C NMR spectra of dicondensed indolinobenzospiropyrans as precursors of thermo‐ and photochromic spiropyrans, DC1–DC5, were completely assigned. Especially, the ^1^H assignment and coupling characteristics of the diastereotopic protons at the carbon‐3 position of the benzopyran rings were achieved by conducting ^1^H–^1^H COSY and nOe experiments. The dihedral angles (θ~1~, θ~2~ and θ~3~) calculated from the experimental values of the vicinal coupling constants (^3^J) of DC5 are in good agreement with the observed values in the solid state. All of the carbons in the DC dye molecules were investigated through a combination of heteronuclear 2D‐shift correlation spectroscopy (HETCOR) and DEPT135. Copyright © 2005 John Wiley & Sons, Ltd.

📜 SIMILAR VOLUMES

Towards the automatic analysis of NMR sp
Towards the automatic analysis of NMR spectra: Part 7. Assignment of 1H by employing both 1H and 1H/13C correlation spectra
✍ Lee Griffiths; Howard H Beeley; Rob Horton 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 156 KB 👁 1 views

## Abstract A reliable method of automatically assigning one‐dimensional proton spectra is described. The method relies on the alignment of the proton spectrum with an associated heteronuclear single‐quantum coherence (HSQC) spectrum, transferring the stoichiometry and couplings to the HSQC. The HS

Assignment of the 1H and 13C NMR spectra
Assignment of the 1H and 13C NMR spectra, sequence and conformation of the synthetic pentasaccharide SanOrg34006 and its precursors
✍ Judica Bootsma; Gerard Wagenaars; Erik Dreef; Floris Hout; Edwin Kellenbach 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 109 KB

## Abstract Proton and carbon chemical shift data and proton–proton coupling constants of the synthetic antithrombotic pentasaccharide SanOrg34006 and its synthetic precursors are reported. Long‐range heteronuclear correlation experiments allow the determination of the substitution pattern of the p

1H and 13C NMR assignments of new oligo-
1H and 13C NMR assignments of new oligo-bipyridine–phenanthroline hybrids as potential precursors of helicate complexes
✍ Rita Annunziata; Maurizio Benaglia; Alberto Bologna 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 145 KB

## Abstract A series of oligo‐bipyridine–phenanthroline hybrids, a new class of potential model ligands, were synthesized and their ^1^H and ^13^C NMR spectra assigned. Copyright © 2002 John Wiley & Sons, Ltd.

Complete assignment of 19F, 1H and 13C N
Complete assignment of 19F, 1H and 13C NMR spectra of monomers and precursors towards bridge trifluoromethylated poly(p-phenylenevinylene)
✍ Alex J. Roche 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 115 KB

## Abstract The complete assignment of ^19^F, ^1^H and ^13^C NMR spectra of 11 trifluoromethylated and four bistrifluoromethylated monomers for bridge trifluoromethylated poly(__p__‐phenylenevinylene) is described. The combination of one‐dimensional ^19^F, ^1^H and ^13^C spectra, long‐range fluorin

Complete assignment of 1H and 13C NMR sp
Complete assignment of 1H and 13C NMR spectra of a set of sulphinyl and sulphonyl monomers toward poly(p-phenylenevinylene) precursors
✍ Albert J. J. M. van Breemen; Peter J. Adriaensens; Anna C. J. Issaris; Margreet 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 76 KB 👁 3 views

The complete assignment of the 1 H and 13 C NMR spectra of sulphinyl and sulphonyl monomers toward poly(p-phenylenevinylene) precursors is presented. For all compounds the same protocol could be used. Resonance assignments were achieved by the use of one-and two dimensional NMR techniques such as 1