𝔖 Bobbio Scriptorium
✦   LIBER   ✦

NMR study of the acetylation of 2,3-diphenylbenzofuran

✍ Scribed by V. Barboiu; H. Wexler; B. Arventiev

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
333 KB
Volume
6
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The positions of acetyl groups introduced by Friedel‐Crafts reactions into 2,3‐diphenylbenzofuran and its derivatives monomethylated in the 5,6 and 7 positions and dimethylated in the 5,6 positions were determined by means of single and double resonance NMR spectra. It was found that the first acetyl group occupies position 6 for all 6‐unmethylated compounds and position 5 for 6‐methylated compounds. The next two acetyl groups enter the para positions (4′ and 4″) of the phenyl groups with the same probability. When positions 5 and 6 are methylated the acetyl group enters positions 7,4′ and 4″ which are found to be of almost equal reactivity. The NMR parameters of compounds studied are listed.

📜 SIMILAR VOLUMES

NMR study of methyl 3,4,6-tri-O-acetyl-2
NMR study of methyl 3,4,6-tri-O-acetyl-2-deoxy-2-(alkylureido)-β-D-glucopyranosides
✍ Iwona Wawer; Małgorzata Weychert; Jan Klimkiewicz; Bogusława Piekarska-Bartoszew 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 117 KB 👁 1 views

Five derivatives of methyl 3,4,6-triacetyl-2-deoxy-(3@-dialkylureido)-b-D-glucopyranoside were studied by 1H and 13C, NMR spectroscopy in solutions and by 13C NMR spectroscopy in the solid state. Sterically CDCl 3 crowded substituents such as n-hexyl and cylcohexyl change the chemical shifts of H-1,

NMR Studies of Substituted 2,3-Diaminopr
NMR Studies of Substituted 2,3-Diaminopropenoates
✍ Simona Golič Grdadolnik; Branko Stanovnik 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 237 KB 👁 1 views

The orientation of substituted amino groups around the double bond in 2,3-diaminopropenoates, versatile agents in the syntheses of heterocyclic systems, was determined in solution by NMR techniques. Nuclear Overhauser enhancement and long-range 13C-1H coupling constants were measured by NOESY or ROE

NMR studies of the configuration of the
NMR studies of the configuration of the isomeric 2,3-dimethyloxetanes
✍ D. F. Ewing; K. A. Holbrook; R. A. Scott 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 265 KB

## Abstract The ^1^H and ^13^C NMR spectra of __cis__‐ and __trans__‐2,3‐dimethyloxetane have been re‐examined and the published NMR assignments shown to be in error.

Synthesis and multinuclear NMR study of
Synthesis and multinuclear NMR study of (E)-s-trans -1-acetyl-5-aryl-3-styryl-2-pyrazolines
✍ V. Vijayabaskar; S. Perumal; S. Selvaraj; A. Lycka; R. Murugan; M. Balasubramani 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 133 KB 👁 2 views

The reaction of triarylideneacetylacetones with hydrazine hydrate in acetic acid a †ords an excellent yield of (E)-s-trans-1-acetyl-5-aryl-3-styryl-2-pyrazolines via decinnamoylation. The structures of these compounds were elucidated using 1H, 13C and two-dimensional NMR techniques such as H,H-COSY,

1H, 13C, 15N and 19F NMR study of acetyl
1H, 13C, 15N and 19F NMR study of acetylation products of heterocyclic thiosemicarbazones
✍ Lyudmila I. Larina; Valentina N. Elokhina; Tatyana I. Yaroshenko; Anatolii S. Na 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 173 KB

## Abstract Novel 2‐acetylamino‐4‐acetyl‐5‐aryl(heteryl)‐1,3,4‐thiadiazolines, 2‐acetylamino‐5‐aryl(heteryl)‐1,3,4‐thiadiazoles, and some of their salts were prepared and studied by multinuclear ^1^H, ^13^C, ^15^N, ^19^F and 2D NMR spectroscopy. The acetylation of thiosemicarbazones is accompanied

NMR Study of Substituted Bicyclo[3.2.1]o
NMR Study of Substituted Bicyclo[3.2.1]octanes
✍ John W. Blunt; Andrew Burritt; James M. Coxon; Peter J. Steel 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 455 KB 👁 1 views

The 'H and I3C NMR spectra of six bromo-and methoxybicyclo[3.2.1]octanes were completely assigned. An axial bromine substituent at C-2 or C-4 results in a 5 ppm upfield shift of C-8 due to the gauche interaction. An equatorial bromine results in an upfield shift of similar magnitude on either C-6 (o