๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Additive proton-proton coupling effects in disubstituted benzenes

โœ Scribed by J.M. Read Jr.; R.W. Crecely; R.S. Butler; J.E. Loemker; J.H. Goldstein

Book ID
104249526
Publisher
Elsevier Science
Year
1968
Tongue
French
Weight
254 KB
Volume
9
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

โœฆ Synopsis

The determination of substituent effects on the NMR parameters in benzene derivatives is a matter of obvious theoretical interest and practical utility.

A number of recent papers have dealt with chemical shifts in substituted benzenes, and it has been found that, within reasonable limits, these shifts follow a simple additivity relation (l-4). Analogous results for coupling parameters are much more limited.

For example, Disc&r recently found that meta couplings in a series of unsymmetrical para-disubstituted benzenes follow an additive relation (5).

Inquiries into additivity of coupling parameters of substituted benzenes have been hampered in part by the unavailability of the coupling values for benzene itself and by difficulties inherent in the analysis of the spectrai patterns of the monosubstituted benzenes. Recently these problems have been overcome by analysis of

๐Ÿ“œ SIMILAR VOLUMES

NMR spectral parameters of Ortho-disubst
NMR spectral parameters of Ortho-disubstituted benzenes. Investigation of the additivity of substituent effects on the proton-proton coupling constants
โœ S. Castellano; R. Kostelnik ๐Ÿ“‚ Article ๐Ÿ“… 1967 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 320 KB

also required of the values of Jo determined from canpounds with the same substituents in & and meta positions; and of the values of J, determined from ortho. meta and E-disubstituted benzenes. This treatment of the data offers the opportunity of deducing spectral parameters of benzene as accurate