Kitayama T,Ute K,Hatada K.NMR Assignment of the Terminal Methine Proton inPoly (methyl methacrylate) and Location of the Butyl Isopropenyl Ketone Unit in thePolymer Molecule Produced by Butyllithium and Butylmagnesium Chloride. Polymer Journal . 1984...
183 developed crosslinked sulfonated PAEKs for applications in proton exchange membranes (PEMs). Crosslinkable sulfonated PAEK copolymers were synthesized with a crosslinking agent (3-ethynylphenol) at the chain end. The ethynyl moiety formed a benzene ring after upon heating and subsequently, a ...
Further heating of these compounds with D2SO4 of various concentrations showed no further change of the NMR spectrum under moderate conditions; under forcing conditions the isoxazoles decomposed. The rate profiles for the isoxazoles indicate that in every case the reaction is proceeding on the free-...
Then, the bromomethylbenzyl groups in the membrane was converted to quaternary ammonium moieties in TMPAEK-NOH. 1H-NMR measurements were used to characterize and confirm the structures of the resulting PAEK- x -BrTM and TMPAEK-NBr derivatives ( x refers to the molar percentage of bromine ...
The one-dimensional (1D) proton nuclear magnetic resonance (1H NMR) data was acquired using an excitation sculpting pulse sequence to remove the solvent peak and maintain a flat baseline [27]. The spectra were collected at 300 K with 32 K data points, 128 scans, 16 dummy scans, and a ...
To determine whether the effects of fatty acids on the diabetic heart during ischemia involve altered glycolytic ATP and proton production, we measured energetics and intracellular pH (pH(i)) by using (31)P NMR spectroscopy plus [2-(3)H]glucose uptake in isolated rat hearts. Hearts from 7-...
The degrees of sulfonation are evaluated by 1H NMR spectroscopy and titration. All the membranes exhibit excellent thermal and dimensional stability, high proton conductivity and low methanol permeability. At 80 °C, the higher proton conductivities (>0.20 S cm 1) of the block polymers can be ...
Response none Storage none Disposal none 2.3 Other hazards which do not result in classification none View all 6. NMR Spectrum13C NMR : Predict 1H NMR : Predict Predict 1H proton NMR Mass spectrum (electron ionization) 7. Synthesis Route5471-51-2Total: 2 Synthesis Route 78...
The methylene protons in the N-CH2-O unit are diastereotopic and the resulting AB quartet in the proton NMR is clearly separated allowing 236 to be used for determining the enantiomeric composition of chiral alcohols.92 Sign in to download full-size image Finally, pyroglutamate can be used to...
PC2 is a calcium-dependent serine proteinase with a pH optimum of 5.0s.2Enzymatic activity requires a low pH; lack of acidification, for example, by blockade of the vesicular proton pump11results in impaired substrate cleavage. PC2 is secreted from constitutively-secreting cells as ...