✍ Scribed by Françoise Lambert; Michel Ellenberger; Louis Merlin; Yves Cohen
No coin nor oath required. For personal study only.
The proton magnetic resonance spectra of catechol, epinephrine, dopamine, synephrine, tyramine and amphetamine have been analysed by computer simulation. The chemical shifts and coupling constants are discussed, with their molecular implications. Convenient parameters are introduced for the additivity of substituent effects on chemical shifts of aromatic protons. The additivity rule of coupling constants is extended to these compounds.
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The proton dynamics in phenylephrine hydrochloride, isoprenaline hydrochloride and norephedrine hydrochloride have been monitored by measuring the temperature dependence of the 'H spin-lattice relaxation times. The results are interpreted as due to C,-hindered reorientation of the NH, and CH, groups
## Abstract The boric acid–catechol system in aqueous solutions has been studied by means of ^11^B, ^1^H and ^13^C NMR over wide ranges of concentration and pH. ^11^B spectra show a striking difference between the complexation possibilities of dilute and more concentrated solutions of boric acid. B