Substituent effects on geminal proton–proton coupling constants
Keyword(s):
The geminal coupling constants between the non-equivalent benzylic protons of a series of para- and meta-substituted N-benzyl-2-methylpiperidines were shown to be proportional to the Hammett σ constants of the substituents with ρ −1.38 in carbon tetrachloride, −1.21 in benzene, and nearly 0 in 1 N DCl solutions. The ρ values were compared with those of other series and were discussed in terms of the possible conformations involved. The chemical shifts of the benzylic protons of the piperidine derivatives did not give a good correlation with the Hammett σ constants in these solvents.
1967 ◽
Vol 8
(51)
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pp. 5211-5216
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Keyword(s):
SOLVENT EFFECTS AS AN AID IN THE ANALYSIS OF THE PROTON MAGNETIC RESONANCE SPECTRUM OF VINYL BROMIDE
1960 ◽
Vol 38
(11)
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pp. 2066-2073
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1974 ◽
Vol 29
(12)
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pp. 1902-1906
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Keyword(s):
Additivity of substituent effects on the proton-proton coupling constants of disubstituted pyridines
1973 ◽
Vol 16
(3)
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pp. 451-457
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1972 ◽
Vol 94
(9)
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pp. 3253-3254
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