Microwave-enhanced metal- and acid-catalysed hydrogen isotope exchange reactions
作者:Jean M Barthez、Anton V Filikov、Lottie B Frederiksen、Marie-Loire Huguet、John R Jones、Shui-Yu Lu
DOI:10.1139/v98-045
日期:1998.6.1
The benefits of using microwaves to accelerate the rates of hydrogen isotope exchange reactions are illustrated by reference to heterogeneous and homogeneous metal-catalysed reactions as well as to...
Deuterium-and N-15-induced isotope effects on H-1 and C-13 chemical shifts of the imino moiety of 16 trans-N-benzylideneaniline (tBA) isotopomers were determined and analysed. These effects appear to be a sensitive probe of molecular conformation and its changes. All determined deuterium isotope effects on the imino-proton are small and negative and are spread in the range from -0.88 ppb in 4-H-2-tBA to -4.97 ppb in H-2(10)-tBA. The effects on the imino-carbon are either positive or negative and have much larger values. Negative sign of isotope effects is primarily governed by lone-pairs, while magnitude and non-additivity depend on the site of isotopic substitution, molecular conformation and distribution of rotamer populations. All N-15 isotope effects on both H-1 and C-13 chemical shifts are positive. A comparison of isotope effects in tBA with those in related isoelectronic compounds is made. (C) 1998 Elsevier Science B.V. All rights reserved.
The Infrared Intensity of the C-D Stretching Vibration in Deuterobenzene, m-Deuteronitrobenzene and m-Deuteroaniline
作者:William G. Dauben、George C. Pimentel、C. Wheaton Vaughan
DOI:10.1021/ja01615a064
日期:1955.5
The Hypophosphorous Acid Deamination of Diazonium Salts in Deuterium Oxide