Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Clifford B. LeMaster"'
Autor:
Clifford B. LeMaster, Ciara R. Huntington, Tyler Webb, Bradley Lopes, Kerstin Hazelbaker, Thomas R. Huntington, Jonathan Prince
Publikováno v:
Surgical Endoscopy. 33:3964-3969
Gasketless laparoscopic insufflator systems are marketed for the ability to prevent desufflation of pneumoperitoneum during laparoscopy. However, surgeons raised concern for possible introduction of non-absorbable room air, including oxygen (O2), wit
Autor:
Clifford B. LeMaster, Keanan Cassidy, Drew Butler, Jonathan Prince, Benjamin Greenwood, Carole L. LeMaster
Publikováno v:
Journal of Molecular Structure. 1146:126-129
Rate constants obtained from total line-shape analysis of five temperature-dependent gas-phase NMR spectra of perfluoroazapropene yielded the kinetic barrier to internal isomerization: G ‡ 298 = 66.9 (0.4) kJ mol −1 . Five temperature-dependent l
Publikováno v:
Journal of Molecular Structure. 553:37-42
Gas-phase 1H NMR spectra of a sample containing 4 Torr of trimethylsilylcyclopentadiene, 1 Torr of CHCl3, and 707 Torr SF6 show exchange broadened line shapes consistent with the degenerate migration of the trimethylsilyl group in the 5-isomer via 1-
Autor:
Clifford B. LeMaster, Carole L. LeMaster, Angela N. Taha, Susan M. Neugebauer-Crawford, Nancy S. True
Publikováno v:
The Journal of Physical Chemistry A. 104:3341-3348
Temperature-dependent Berry pseudorotation rate constants of SF4 gas at ca. 7.9 atm, determined from analysis of exchange-broadened 19F NMR spectra, are consistent with E∞ = 11.9(0.2) kcal mol-1, A...
Publikováno v:
Journal of the American Chemical Society. 121:4478-4484
Rate constants obtained from total line-shape analysis of 11 temperature-dependent gas-phase NMR spectra of (15N)trifluoroacetamide yielded the following kinetic parameters: ΔG⧧298 = 15.1(0.36) kc...
Autor:
Clifford B. LeMaster
Publikováno v:
Progress in Nuclear Magnetic Resonance Spectroscopy. 31:119-154
Publikováno v:
The Journal of Physical Chemistry A. 101:4699-4706
Temperature-dependent gas-phase 1H NMR spectra of seven thiocarbonyl-substituted N,N-dimethylthioamides (YCSN(CH3)2) obtained at 300 MHz are consistent with the following free activation energies ΔG⧧298 (kcal mol-1): Y = H, 22.5 (0.1); CH3, 18.0 (
Publikováno v:
Journal of Molecular Structure. 317:137-145
Pressure dependent gas phase ring inversion rate constants of N -methylpiperazine (MPZ) obtained from line-shape analysis of exchange broadened 1 H NMR spectra can be adequately modeled using RRKM theory indicating that intramolecular vibrational red
Publikováno v:
Journal of Molecular Structure. 317:131-136
Temperature dependent gas phase 1 H NMR spectra of N -ethylmorpholine are consistent with the following activation parameters for the ring inversion process: Δ G Δ = 47.7(0.3) kJ mol −1 , Δ H Δ = 47.1(2.3) kJ mol −1 , Δ S Δ = −1.9(4.9) J
Publikováno v:
ChemInform. 22
Gas-phase free activation energies, Δ G ‡ 298 , for syn⇌anti conformational exchange in n -propyl, n -butyl, and isobutyl nitrite are 11.3 (0.2), 11.4 (0.2) and 11.3 (0.2) kcal mol −1 , respectively. For 1 mol% solutions in CS 2 , Δ G ‡ 298