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View article: Study of the protonation of simple Schiff bases in solvents of various polarity by means of Raman spectroscopy
Study of the protonation of simple Schiff bases in solvents of various polarity by means of Raman spectroscopy Open
In this study, the protonation of simple Schiff bases by organic acids in various solvents is investigated by Raman spectroscopy and the spectral response of the C=N + stretching mode is correlated with the macroscopic properties of the me…
View article: <sup>1</sup>H NMR studies of proton transfer in Schiff base and carboxylic acid systems
<sup>1</sup>H NMR studies of proton transfer in Schiff base and carboxylic acid systems Open
When the unconjugated Schiff base, isobutylidene isopropylamine (2), reacts with acids such as the mineral acids HCl, HBr, and HI, or the carboxylic acids trichloroacetic, monochloroacetic, and propionic acid, in CDCl 3 , several complexes…
View article: A <sup>13</sup>C and <sup>15</sup>N nuclear magnetic resonance study of the protonation of a retinal Schiff base by acids of different p<i>K</i><sub>a</sub>s and in solvents of different polarities
A <sup>13</sup>C and <sup>15</sup>N nuclear magnetic resonance study of the protonation of a retinal Schiff base by acids of different p<i>K</i><sub>a</sub>s and in solvents of different polarities Open
13 C and 15 N nuclear magnetic resonance spectra of mixtures of all-trans-retinylidene tert-butylamine (RtBA) and substituted acetic acids in equimolar concentrations in both CDCl 3 and CD 3 OD were studied in relation to two questions: th…
View article: Protonation of a conjugated Schiff base by weak to strong acids: a <sup>13</sup>C and <sup>15</sup>N nuclear magnetic resonance study
Protonation of a conjugated Schiff base by weak to strong acids: a <sup>13</sup>C and <sup>15</sup>N nuclear magnetic resonance study Open
The interactions (mostly protonation) between several carboxylic and mineral acids and trans,trans-2,4-heptadienylidene tert-butylamine (HBA) were determined by 13 C and 15 N nuclear magnetic resonance spectroscopies. Results indicate that…
View article: The photochemical event in rhodopsins
The photochemical event in rhodopsins Open
The photochemical step in the functioning of visual and bacterial rhodopsins entails cis–trans or trans–cis isomerization and changes in the state of protonation of the retinylidene Schiff base chromophore. In this review our present knowl…
View article: Effects of solvents on a model of rhodopsin consisting of a conjugated imine and substituted acetic acids
Effects of solvents on a model of rhodopsin consisting of a conjugated imine and substituted acetic acids Open
A model system of rhodopsin consisting of a dienylidene Schiff base and different halogeno acids has been studied in two solvents, chloroform and methanol, by uv and 400-MHz nmr spectroscopies. The uv results indicate that in chloroform, a…
View article: Reactions of Aralkyl and Unsaturated Chloramines: The Nitrenium Ion Question
Reactions of Aralkyl and Unsaturated Chloramines: The Nitrenium Ion Question Open
Evidence for intermolecular electrophilic halogenation of aromatic rings and olefinic double bonds by aliphatic chloramines at low pH, and for homolytic cyclization of unsaturated chloramines in neutral medium is presented. Independent pro…
View article: Reactions of Chloramines with Ag(0) and Ag(I) States
Reactions of Chloramines with Ag(0) and Ag(I) States Open
Reactions of N-chloroazacyclooctane and N-chloroazacyclononane are described which give good yields of bicyclic amines. These are: (a) short chain homolytic reactions involving neutral nitrogen radicals initiated by ferrous ion or metallic…