𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Proton and carbon NMR spectra of 4-substituted 1-acetylnaphthalenes

✍ Scribed by S. Perumal; G. Vasuki; D. A. Wilson

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
350 KB
Volume
28
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The proton and carbon spectra of ten 4‐X‐l‐acetylnaphthalenes have been assigned. Shift correlations have been made with benzene substituent‐induced chemical shifts (SCS, Lynch plots) and with dual substituent parameters (DSP) in the manner successfully done for many series of 1,4‐disubstituted benzenes. The results obtained are compared with those for 4‐X‐acetophenones and 1‐X‐naphthalenes. The main conclusions are (i) the carbon para to the variable substituent X is more sensitive to change of substituent in the naphthalenes than in the benzenes, (ii) of the carbons ortho to the variable substituent X, that at C‐3 is more sensitive and that at C‐4a is less sensitive, to change of substituent in the naphthalenes than in the benzenes, (iii) the effect of the 4‐substituents on the shift of H‐8 in 1‐acetylnaphthalenes is due mainly to changes in the carbonyl dipole affecting the diamagnetic screening of the proton.

📜 SIMILAR VOLUMES

Carbon-13 and proton NMR spectra of 1(2H
Carbon-13 and proton NMR spectra of 1(2H)-isoquinolinone, 1(2H)-phthalazinone, 4(3H)-quinazolinone and their substituted derivatives
✍ S. L. Spassov; I. A. Atanassova; M. A. Haimova 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 359 KB

The 13C NMR chemical shifts, one-bond and some long-range l3C-'H coupling constants and the 'H NMR chemical shifts for isoquinolinone, phthalazinone, quinazolinone and their derivatives containing CH, COOH, COOCH, and CH,COOH substituents in the hetero-ring are reported. The NMR data are in agreemen

Proton and carbon-13 NMR studies of 1-su
Proton and carbon-13 NMR studies of 1-substituted pyridinium salts
✍ Alan R. Katritzky; Zofia Dega-Szafran 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 282 KB

H and 13C NMR chemical shifts of a series of 1 -substituted pyridinium salts were measured in dimethyl sulfoxide. The effect of the quaternary pyridinium ring on the resonance of the methylene group of the substituent is reported. Increments of 6'H = 3.89 f 0.1 6 ppm and 6' 3C = 47.5 f 3.7 ppm are e

Proton-coupled carbon-13 NMR spectra of
Proton-coupled carbon-13 NMR spectra of butadienes
✍ Robin K. Harris; Soon Ng; Alan Connelly 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 434 KB 👁 1 views

## Abstract Proton‐coupled ^13^C NMR spectra were obtained for three methyl‐substituted butadienes, namely 2‐methylbuta‐1,3‐diene, __trans__‐2‐methylpenta‐1,3‐diene and 2,4‐dimethylpenta‐1,3‐diene. The second‐order spectra were analysed by computer, using some new ^1^H NMR data, and the resulting c

Carbon-13 NMR spectra of some 4- and 5-s
Carbon-13 NMR spectra of some 4- and 5-substituted pyrimidines
✍ Gordon W. H. Cheeseman; Christopher J. Turner; Desmond J. Brown 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 299 KB

## Abstract Carbon‐13 NMR chemical shifts and carbon‐proton coupling constants for nine 4‐substituted and six 5‐substituted pyrimidines are reported. The carbon chemical shifts are correlated with π‐electron densities. Carbon‐proton coupling constants fail to correlate with substituent electronegat

Carbon-13 NMR spectra of some 4-substitu
Carbon-13 NMR spectra of some 4-substituted phenacyl bromides
✍ Fred Yukio Fujiwara; Roberto Rittner; Haydeé R. Freire 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 115 KB

The 13C NMR signals for some 4substituted phenacyl bromides were assigned. The experimental chemical shifts of the aromatic ring carbons are in close agreement with those calculated using substituent chemical shifts. Both the car-bony1 and the a-methylene carbons exhibit upfield shifts compared with