Results 241 to 250 of about 281,059 (296)
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Journal of Fluorine Chemistry, 1991
Abstract A study of NMR coupling constants, 1J(13C13C), of compounds containing a CF3 group has revealed that the values for the coupling of the CF3 carbon with the neighbouring carbon are exceptionally large [1]. In a series of compounds in which the CF3 group is bonded to a spa3, sp2, and sp-carbon the 1J(CC) values show a very good linear ...
W. Gombler, F. Behle, G. Bollmann
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Abstract A study of NMR coupling constants, 1J(13C13C), of compounds containing a CF3 group has revealed that the values for the coupling of the CF3 carbon with the neighbouring carbon are exceptionally large [1]. In a series of compounds in which the CF3 group is bonded to a spa3, sp2, and sp-carbon the 1J(CC) values show a very good linear ...
W. Gombler, F. Behle, G. Bollmann
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13C–13C dipolar spectra in solids
The Journal of Chemical Physics, 1977A single crystal NMR study has been made of the 13C–13C dipolar interaction in oxalic acid dihydrate (HOX) and diammonium oxalate monohydrate (DAOX). The results show that indirect contributions to the interaction are negligibly small so that the dipolar tensor provides information on the C–C bond length and orientation in the crystal lattice.
H. van Willigen +2 more
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Elastic scattering of 13C from 13C
Nuclear Physics A, 1973Abstract Angular distributions and excitation functions for 13 C+ 13 C elastic scattering have been measured in the energy range E (lab) = 14.0–27.5 MeV. The angular distributions at E (lab) = 15, 16, 18 and 20 MeV can be described fairly well with the method of molecular wave functions.
H.-D. Helb +5 more
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J(13C13C) in allylmetal complexes
Journal of Organometallic Chemistry, 1982Abstract The J(13C13C) coupling constants of simple allyl compounds of nickel, chromium, magnesium and lithium have been determined on natural abundance samples. In transition metal complexes 1J(13C13C) is reduced to 41 Hz (Ni) whilst in allyllithium it is 58.7 Hz.
Reinhard Benn, Anna Rufińska
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1J(13C, 13C) in (η4-butadien)übergangsmetallkomplexen
Journal of Organometallic Chemistry, 1987The indirect scalar spin-spin coupling constant 1J(13C, 13C) has been determined in dissolved (η4-diene)transition metal complexes using natural-abundance samples of complexes of Zr, Hf, Th, Mo, W, Fe, and Co. 1J(13C, 13C) is a sensitive probe for metal-diene bonding in such complexes: In planar η4-s-cis-diene compounds with similar carbon bond lengths,
Reinhard Benn, Anna Rufińska
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13C Scrambling of [5-13C]5-cyclodecynone
Tetrahedron Letters, 2000Scrambling of [5-13C]5-cyclodecynone occurs as a result of acidic conditions that preclude its rapid consumption.
Michael F Wempe, John R Grunwell
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M1 from factors of 13C, 13C and 15N
Nuclear Physics A, 1981Abstract Core polarization effects are shown to explain both the reduction of the second peak of the M1 form factor of 13 C(e,e) 13 C and the enhancement of that of 12 C(e,e') 12 C (1 + , T = 1, 15.1 MeV) over the Cohen-Kurath predictions.
T. Suzuki, H. Hyuga, A. Arima, K. Yazaki
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13C-13C Coupling-Constants in Carboxylate Esters
Microchemical Journal, 1993Abstract Isotopic enrichment or a multipulse NMR experiment (INADEQUATE) was utilized to measure the 13 C- 13 C coupling constants for a collection of carboxylate esters. Significantly different values were measured for the C 2 C 3 bond of endo - and exo -2-norbornyl acetates. The 13 C- 13 C coupling constants for the CαCO bond of substituted
R.M. Jarret +7 more
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Fusion cross sections for 12C + 12C, 12C + 13C and 13C + 13C at low energies
Nuclear Physics A, 1982Abstract Fusion cross sections for 12 C + 12 C and 12 C + 13 C have been measured by the total-γ-ray- yield method over the c.m. energy intervals 4.2–7.0 MeV and 3.1–6.7 MeV, respectively. Comparing the present 12 C + 12 C fusion cross sections with those obtained previously by various methods, the discrepancies between data are clarified.
Binay Dasmahapatra +2 more
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Oxidation of exogenous [13C]galactose and [13C]glucose during exercise
Journal of Applied Physiology, 1995The present study examined the oxidation of exogenous galactose or glucose during prolonged submaximal cycling exercise. Eight highly trained volunteers exercised on two occasions on a cycle ergometer at 65% of maximal workload for 120 min, followed by a 60-min rest period and a second exercise bout of 30 min at 60% maximal workload.
D P, Leijssen +3 more
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