𝔖 Bobbio Scriptorium
✦   LIBER   ✦

1H n.m.r. spectra of N-phenylmaleimide in isotropic and nematic phases

✍ Scribed by C. L. Khetrapal; P. Diehl; A. C. Kunwar

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
234 KB
Volume
10
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

^1^H n.m.r. spectra of N‐phenylmaleimide have been investigated in isotropic as well as nematic phases; the chemical shifts, the direct dipolar and the indirect spin–spin coupling constants have been determined. The direct dipolar coupling constants are consistent with rapidly interconverting energetically equivalent twisted conformations of C~2~ symmetry. Under the assumption that only two such conformers are predominantly present, the angle between the phenyl and the maleimide planes is determined as 52.9±0.9°.

📜 SIMILAR VOLUMES

Stable conformations of N,N,N′,N′- tetra
Stable conformations of N,N,N′,N′- tetraisopropylthiuram disulphide and monosulphide found in low temperature 1H N.m.r. spectra
✍ Yu-ichi Takeda; Tsuneo Matsuda; Toshio Tanaka 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 324 KB

## Abstract ^1^H N.m.r. spectra of __N__,__N__,__N__′,__N__′‐tetraisopropylthiuram disulphide and monosulphide in CS~2~ suggested that internal rotations both around the carbamate CN and isopropyl–nitrogen bonds are restricted at low temperatures. As a result, both compounds exist as two __dl__ pa

1H n.m.r. spectra of 6-acetoxy-2,4-cyclo
1H n.m.r. spectra of 6-acetoxy-2,4-cyclohexadienones
✍ W. A. Bubb; C. J. Fallick; S. Sternhell 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 411 KB

## Abstract ^1^H n.m.r. spectra of 36 derivatives of 6‐acetoxy‐2,4‐cyclohexadienones were analysed. All available evidence indicates that all members of the series have similar conformations which do not depart significantly from planarity. Substituent‐induced chemical shifts and interproton coupli

1H NMR spectra and structures of some bi
1H NMR spectra and structures of some bicyclic compounds oriented in nematic phases
✍ P. Diehl; H. Zimmermann 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 242 KB 👁 1 views

## Abstract The ^1^H n.m.r. spectra of 1,4,5‐triazanaphthalene, benzothiazole and quinoline oriented in nematic liquid crystalline phases have been analysed and the parameters used to determine the interproton distance ratios.

Fluorescence spectra of polybenzamide in
Fluorescence spectra of polybenzamide in isotropic and nematic solutions
✍ Fenglian Bai; Shufan Zhang; Junlin Yang; Renyuan Qian 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 344 KB

## Abstract The fluorescence spectra of polybenzamide (PBA) in __N__,__N__‐dimethylacetamide with 3% LiCl (A) and in 98% H~2~SO~4~ (B) solutions have been studied both in very dilute and in nematic solutions. Stacked chromophores of PBA play an important role in the formation of nematic phase. Fluo

1H and 13C n.m.r. spectra of dichloro(tr
1H and 13C n.m.r. spectra of dichloro(trans-2-chlorovinyl)arsine
✍ Jaakko Paasivirta; Raili Versterinen; Liisa Virkki; Pekka Pyykkö 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 152 KB

## Abstract Proton and carbon magnetic resonance spectra of Lewisite or dichloro(__trans__‐2‐chlorovinyl)arsine have been measured and the results are compared with the n.m.r. spectral parameters of other __trans__‐1,2‐substituted ethylenes. The coupling constants can be rationalized by substituent