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Autor:
Fadhil S. Kamounah, Salman R. Salman
Publikováno v:
Spectroscopy Letters. 35:327-335
Enol-Keto tautomerism in a new novel series of naphthylidineaniline Schiff bases were studied using their mass spectrum. Two model compounds, namely, salicylidineaniline (Model compound 1, series 1) and naphthylidinequinolinamine Schiff base (Model c
Publikováno v:
Spectroscopy Letters. 31:269-274
The 13C NMR spectra of a series of N-acyl six-member ring nitrogen heterocycles have been measured as a function of temperature and the results interpreted in terms of restricted amide rotation and ring inversion. Slow rotation is observed on the NMR
Autor:
Salman R. Salman, George Y. Sarkis
Publikováno v:
Spectroscopy Letters. 29:1573-1577
The carbon -13 chemical shift of nine new substituted 2-amino benzothiazole is presented. The calculated chemical shift, using substituent parameters, agrees with the observed one.
Autor:
Ted Schaefer, Salman R. Salman, Rudy Sebastian, David M. McKinnon, James D. Baleja, Glenn H. Penner
Publikováno v:
Canadian Journal of Chemistry. 69:620-624
The proximate coupling constants, 5J, between ortho and methyl protons in thioanisole and 18 of its derivatives are discussed as conformational indicators. On the assumption that 5J varies as cos4θ, for 0° ≤ θ ≤ 90°, θ being the angle by whi
Publikováno v:
Magnetic Resonance in Chemistry. 28:645-650
Multinuclear NMR experiments on fluorinated β-diketones have furnished information on the various tautomers present in solution and their proportions. 2-Trifluoroacetyl-1-indalone in CDCI3 solution exists in the enol form, as a mixture of exocyclic
Autor:
S. Noor, Salman R. Salman
Publikováno v:
Thermochimica Acta. 159:187-191
The thermal behaviour of six hydroxy Schiff's bases was studied using TG and DTA. It was found that compounds with steric crowding have a thermal behaviour different from those without this effect. The trend of fragmentation for the two groups is dis
Autor:
Salman R. Salman, Fadhil S. Kamounah
Publikováno v:
Spectroscopy.
Tautomeric equilibria in intramolecularly hydrogen bonded Schiff bases is studied on the basis of solution13C NMR chemical shifts. NMR spectroscopic data and comparison with two anils model compound, namely, salicylideneaniline (1A) and naphthalylidi
Autor:
Salman R. Salman
Publikováno v:
Spectrochimica Acta Part A: Molecular Spectroscopy. 39:1073-1076
Proton coupled and decoupled carbon-13 spectra of several substituted naphthalenes have been analysed to give a complete assignment of the carbon chemical shifts of these compounds. The observed carbon-13 chemical shifts of 22 substituted methoxy and