The lanthanide-induced shifts (LIS) of the lanthanide shift reagent (LSR) Eu(FOD)3 are reported for a large number of cyclohexanones, especially those which are highly substituted. The following compounds were synthesized and characterized: 3-(aryl)-3,5,5-trimethylcyclohexanones, in which aryl...
The first application of tritium NMR spectroscopy to the direct observation of proton-exchange kinetics is described; this technique allows the study of milligram amounts of substrates and for substrates with multiple exchangeable positions. The examples include benzene and the ring and methyl positions...
New hybrid proton conducting membranes based on sulfonated copolymers of styrene and allyl glycidyl ether using tetraethyl orthosilicate were syntheses. The composition and structure of the copolymers and membranes has been proven by elemental analysis, IR and NMR spectroscopy. Based on quantum chemical ...
FIG. 4 is a1H-NMR spectrum of a Compound (A-1) obtained in Example 1. FIG. 5 is a1H-NMR spectrum of a Compound (1) obtained in Example 1. BEST MODE FOR CARRYING OUT THE INVENTION The polyarylene, the process for producing the same, the solid polyelectrolyte, and the proton-conduct...
It is possible to use, in particular, spectroscopic methods, for example NMR spectroscopy, for this purpose. It needs to be remembered that the phosphonic acid groups are in the formal oxidation state 3 and the phosphorus in phosphoric acid, polyphosphoric acid and hydrolysis products thereof is ...
Lanthanide-induced shifts in proton NMR spectra of cyclohexanonesdoi:10.1002/mrc.1270050107Shapiro, B. L.Johnston, M. D.Shapiro, M. J.Magnetic Resonance in Chemistry
The proton NMR spectra of several diphenyl, dithienyl and difurylspiroketones have been analysed and compared with the spectra of the analogous spiroketones without aryl groups. The comparison reveals that the two benzene, thiophene and furan rings in the diarylspiroketones exert a strong shielding...
Factors such as the reaction temperature and molar ratio of catalyst to initiator, which could affect the ATRP system, were discussed in the paper. Chain extension was conducted using polymer as the macro-initiator which was characterized via 1H NMR. The optical property of initiator was well ...
Lanthanide-induced shifts in proton NMR spectra of cyclohexanonesdoi:10.1002/mrc.1270050107B. L. ShapiroDepartment of Chemistry, Texas A & M University College Station, Texas 77843, USAM. D. JohnstonDepartment of Chemistry, Texas A & M University College Station, Texas 77843, USAM. J. Shapiro...
The Benesi-Hildebrand method was used in NMR Spectroscopy to study the hydrogen bonding of iodoform with ten proton acceptors in cyclohexane at 25.0°C. The values of K's (M-1) and Δc's (H2) of iodoform systems were determined as followings: N, N–dimethylacetamide, 0.73, 50.5; ...