نتایج جستجو برای: nmr spectra
تعداد نتایج: 160021 فیلتر نتایج به سال:
a green and convenient protocol is described for the preparation of 1-(alkylamino)-3-(1,3-dioxoisoindolin-2-yl)-2-methyl-1-oxopropan-2-yl benzoates via one-pot three-component reaction between 2-(2-oxopropyl)isoindoline-1,3-dione, an alkyl isocyanide and an aromatic carboxylic acid in water at room temperature. the methods used to follow the reactions are tlc and nmr, which indicated that there...
We have observed 1H NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecula...
The NMR spectra of paramagnetic substances can feature shifts over thousands ppm. In high magnetic field instruments, this corresponds to extreme offsets, which make it challenging or impossible achieve uniform excitation without phase distortion. Furthermore, because the intrinsic presence a dead time during spins freely evolve, further distortion occurs. A decade ago, processing approach base...
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