Chemical transformations that introduce, remove or manipulate functional groups are ubiquitous in synthetic chemistry1. Unlike conventional functional-group interconversion reactions that swap one functionality for another, transformations that alter sol
The structure of macromolecular compounds of soils is studied by 13 C NMR and ESR. Data on the structural and functional group characteristics and paramagnetic activity of humus compounds may provide a basis for developing methodological approaches to parametric characterization of the environmental potenti...
1992. Functional group content of soil and sedimentary humic acids determined by CP/MAS 13CNMR related to conditional Zn2+ and Cd2+ formation constants. Sci. Total Environ. 113:121-132.Cameron, D.F. and Sohn, M.L. 1992. Functional group content of soil and sedimentary humic acids ...
摘要: The composition of carbon (C) functional groups in natural organic matter (NOM), such as dissolved organic matter, soil organic matter, and humic substances, is frequently estimated using solid-state 13...关键词: Solid-state 13C NMR Phase-adjusted side band suppressing (PASS) Cross ...
These two functional groups are probably the origin of phytotoxicity expression in compost quality tests. Thus, a simple and precise quality test could be performed to evaluate directly the phytotoxicity and maturity of compost. 展开 关键词: NMR-13C Tomato residue Compost Phytotoxicity C/Nratio ...
Obtained as yellow solid (66.9 mg, 64%); Purified using hexane/ethyl acetate (70:30); mp: 99–101 °C;1H NMR (300 MHz, CDCl3)δ 8.28 (d, J = 6.9 Hz, 1H), 8.11 (d, J = 6.9 Hz, 2H), 7.71 (d, J = 9.0 Hz, 1H), 7.46–7.26 (m, 6H), 7.19 (t, J ...
近日,利物浦大学Alexey G. Sergeev课题组在JACS上发表题为“Selective ortho-C–H Activation in Arenes without Functional Groups”的文章,作者发现一类简单的金属铱配合物,可以实现非官能团化烷基芳烃的区域选择性邻位C–H活化,并对其机理进行了研...
Least squares curve fitting techniques have been used to resolve the overlapping bands in the 0-220 ppm region of the 13c NMR spectra. Measurements of the relative intensities of the functional groups observed in the oxidized coals were used to follow the progress of air oxidation. Oxidation ...
The NMR structure of the C2 domain (PDB ID: 2JQZ) and the X-ray crystal structure of the HECT domain (PDB ID: 1ZVD) of SMURF2 protein were downloaded from the Protein Data Bank29,32. The lowest energy state model (Model 1) from the ensemble of C2 structures was selected for the ...
Fraction of aromatic carbons Car can be straightforwardly found from NMR spectra:(1)Car=Iar∑jIj,where Car is the fraction of aromatic carbons, Iar is the total integral intensity of aromatic carbons and Ij is the integral intensity of all functional groups in 13C NMR spectrum of the ...