A one-dimensional procedure, based upon separated-local-field spectroscopy with magic-angle spinning, is presented that can be used to assign 13 C resonance lines in a CP/MAS spectrum on the basis of number of protons attached to carbons. While previous methods have relied upon two-dimensional...
Carbon-13 nuclear magnetic resonance spectra of lignins From the 13C-nmr spectra of a large number of dimeric and monomeric lignin model compounds the chemical shifts of the carbon atoms of the C 9-units in lign... HD Lüdemann,HH Nimz - 《Biochemical & Biophysical Research Communications》 ...
Carbon forms a large number of compounds because of its unique ability to form stable covalent bonds with other carbon atoms and also with hydrogen, oxygen, nitrogen, and sulphur atoms, resulting in the formation of a variety of compounds containing chains and rings of carbon atoms. ...
The 13C NMR spectra of a large number of closely related saturated and unsaturated dicarboxylic acids and their anhydrides and derivatives have been analyzed to determine the structural and electronic effects which govern their chemical ... KL Williamson,MU Hasan,DR Clutter - 《Journal of Magnetic ...
Given for this andsubsequentreactions are the energy released (Q) in millions of electron volts (MeV) and the half-life (t1⁄2). It should be noted that in alpha decays the charges, or number of protons, shown in subscript are in balance on both sides of the arrow, as are the ato...
3 - methylpentane Predict the number of signals Cyclohexane Predict the number of signals Butylamine Predict the number of signals 2 - chlorobutane Predict the number of signals 4-pentenoic acid Predict the number of signals Predict the number of signals methyl butanoate Predict the number of ...
b Change of the formal oxidation number of the reaction site in cascade processes. R—reagent. P1–4,Pn—product 1–4, n. c An oxidative-reductive cascade process that is based on the transfer of electrons and protons and illustrated by tetramerization of benzylamine. et‒—trapped electron...
Because the local pH becomes higher and the number of protons decreases with the incorporation of CO into the reactant stream due to the fact that CO does not react with OH− like CO2, the production rate of n-propanol declines slightly once the percentage of CO increases in the CO/CO2...
ArticleOpen access13 April 2020 Introduction The atomic nucleus is generally regarded as a compact quasi-sphere composed of nucleons (neutrons and protons) moving almost independently inside a self-consistent mean field1,2. However, the shape and internal structure configuration of a nucleus can be...
Although fluxes of DOC and POC are relatively small on a global scale (<1% global land-ocean fluxes), a growing number of studies have observed that glacier derived DOC and POC are highly bioavailable2,106, and thus could be important in fuelling bacterial respiration in receiving aquatic ecos...