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Additivity of proton and carbon nmr chemical shifts in protonated benzene carboxylic acids
Author(s) -
Bruck Daniel,
Rabinovitz Mordecai
Publication year - 1978
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270111202
Subject(s) - conjugate , protonation , benzene , chemistry , chemical shift , proton , additive function , carbon fibers , medicinal chemistry , organic chemistry , materials science , mathematics , ion , mathematical analysis , physics , quantum mechanics , composite number , composite material
The additivity of the proton and carbon chemical shift increments due to structural changes in a series of conjugate acids derived from benzene polycarboxylic acids is reported. In the acids, two sets of increments had been applied, one to the ortho diacids and one to acids which do not bear ortho substituents. In the conjugate acids only one set of increments is required. The disappearance of the ‘ ortho ’ effect may be the outcome of properties inherent to these conjugate acids.