Application In Synthesis of Trimethylphosphineoxide. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Trimethylphosphineoxide, is researched, Molecular C3H9OP, CAS is 676-96-0, about Solid-state 31P NMR mapping of active centers and relevant spatial correlations in solid acid catalysts. Author is Yi, Xianfeng; Ko, Hui-Hsin; Deng, Feng; Liu, Shang-Bin; Zheng, Anmin.
Solid acid catalysts are used extensively in various advanced chem. and petrochem. processes. Their catalytic performance (namely, activity, selectivity, and reaction pathway) mostly depends on their acid properties, such as type (Bronsted vs. Lewis), location, concentration, and strength, as well as the spatial correlations of their acid sites. Among the diverse methods available for acidity characterization, solid-state NMR (SSNMR) techniques have been recognized as the most valuable and reliable tool, especially in conjunction with suitable probe mols. that possess observable nuclei with desirable properties. Taking 31P probe mols. as an example, both trimethylphosphine (TMP) and trimethylphosphine oxide (TMPO) adsorb preferentially to the acid sites on solid catalysts and thus are capable of providing qual. and quant. information for both Bronsted and Lewis acid sites. This protocol describes procedures for (i) the pretreatment of typical solid acid catalysts, (ii) adoption and adsorption of various 31P probe mols., (iii) considerations for one- and two-dimensional (1D and 2D, resp.) NMR acquisition, (iv) relevant data anal. and spectral assignment, and (v) methodol. for NMR mapping with the assistance of theor. calculations Users familiar with SSNMR experiments can complete 31P-1H heteronuclear correlation (HETCOR), 31P-31P proton-driven spin diffusion (PDSD), and double-quantum (DQ) homonuclear correlation with this protocol within 2-3 d, depending on the complexity and the accessible acid sites of the solid acid samples.
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