Proton N M R spectra of ]-substituted 2,4-dimethylbcnzenes (2). I-substituted 2.6dimethylbenzenes (3) and 1-substituted 2,4,6-trimethylbenzenes (4) were determined and the SCS values compared with those of monosubstituted benzenes (1). SCS of 1 are assumed to be primarily due to the effects of x-ele
Substituent effects in proton NMR of monosubstituted acetophenones: I
✍ Scribed by G. A. Caplin
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- English
- Weight
- 436 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Chemical shifts are reported for the acetyl protons in a series of para‐substituted acetophenones in a number of solvents, and substituent effects evaluated statistically by means of the Swain‐Lupton multiple correlation analysis. A basic set of substituents was built up by careful choice of substituted derivatives, and it was shown that this facilitated the possibility of valid comparisons of substituent effects between differing systems. Strong emphasis was placed on the idea of individuality of substituents and solvents.
📜 SIMILAR VOLUMES
## Abstract Lanthanide‐induced shifts have been measured for some α‐heterosubstituted __N__,__N__‐diethylacetamides, using Eu(fod)~3~ in CCl~4~ solution. The resonances for the __syn__‐ and __anti__‐methylene and ‐methyl protons have been assigned unambiguously for some of these bifunctional amides
The proton shifts of trans-decalin and of its Phydroxy derivative were determined by 2D NMR methods, supported in the latter case by lanthanide-induced shifts. Based on these shifts and on literature data, substituent (X)-induced chemical shifts (SCS) were obtained for the PX-trans-decalins for X =