Nuclear magnetic resonance study of exchanging systems. X. Rotational barriers to trans-cis isomerization in esters.
スポンサーリンク
概要
- 論文の詳細を見る
The <SUP>13</SUP>C NMR spectra of <I>t</I>-butyl formate (<B>1</B>), 1,1-diethylpropyl formate (<B>2</B>), and 2,6-dimethylphenyl formate (<B>3</B>) were measured at various temperatures. It was found that the signals of the <I>trans</I> and <I>cis</I> isomers in <B>1</B> and <B>2</B> are separated at very low temperatures, and that the signal of <B>3</B> only shows a slight line broadening. The complete line shape analyses of these temperature-dependent spectra were performed. The activation energies <I>E</I><SUB>a</SUB>(<I>t</I>-<I>c</I>) of the isomerization from the <I>trans</I> isomer to the <I>cis</I> were determined to be 10.9 kcal/mol for <B>1</B> and 7.2 kcal/mol for <B>2</B>.
- 公益社団法人 日本化学会の論文
著者
-
NAKANISHI Hiroshi
National Chemical Laboratory for Industry
-
YAMAMOTO Osamu
National Chemical Laboratory for Industry
-
Fujita Hitoshi
National Chemical Laboratory for Industry
関連論文
- Pd4 REFINEMENET OF MOLECULAR MECHANICS PARAMETERS : XV. ESTER AND ETHER GROUPS
- Structural Analysis of Xyloglucan Oligosaccharides by the Post-source Decay Fragmentation Method of MALDI-TOF Mass Spectrometry : Influence of the Degree of Substitution by Branched Galactose, Xylose, and Fucose on the Fragment Ion Intensities
- Post-source Decay Fragment Analysis of a Highly Branched Nonasaccharide of Xyloglucan Using MALDI-TOF Mass Spectrometry
- Structural Analyses of Xyloglucan Heptasaccharide by the Post-source Decay Fragment Method Using Matrix-assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry
- NMR Spectroscopic Analysis of Sulfated β-1, 3-Xylan and Sulfation Stereochemistry
- Structural Clarification of Caulerpa Cell Wall β-1, 3-Xylan by NMR Spectroscopy
- Negative-Mode Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry of Maltoheptaose and Cyclomaltooligosaccharides
- Studies on Ring Region of Human Collagen α2(IV) Recognized By Monoclonal Antibodies
- Structural studies of Endothelin peptides : ET-2
- Production of thiotropocin by a marine bacterium, Caulobacter sp. and its antimicroalgal activities
- Distinguishing of Linkage Isomers of Lactotetra Oligosaccharides by Using the Relative Ion Intensity Analysis of Post-source Decay Fragment Ions in Curved-field Reflectron Matrix-assisted Laser Desorption/ionization Time-of-flight Mass Spectrometry
- Chemical Synthesis and Structural Studies of a 7 KDa Peptide Related to a Plant Derived Ethylene-Inducible DNA Binding Protein
- ^1H Nuclear Magnetic Resonance Study of Hydrated Surface of Ultra-Fine Powder of Aluminum Nitride
- Syntheses and structures of indolo[6,7-g]indoles, a new heteroaromatic system.
- Restricted Rotation Involving the Tetrahedral Carbon. XI. Barriers to Rotation and Conformational Preferences of Substituted 9-Isopropyltriptycenes
- 27Al high-resolusion solid-state NMR study of hydration of ultrafine powder of aluminum nitride.
- The ditermination of the ratio of two kinds of hydrogen in metal hydrides by means of pulsed NMR.
- High resolution 29Si nuclear magnetic resonance study on gallosilicates with zeolitic structures.
- Multinuclear solid-state NMR study of dehydration of Na-Y type zeolites.
- The synthesis of heteroaromatic cations containing sulfur or selenium atoms.
- Nuclear magnetic resonance study of exchanging systems. XI. 13C NMR spectra of 9-ethyltriptycene derivatives and the restricted rotation of the ethyl group.
- Nuclear magnetic resonance study of exchanging systems. IX. The slow rotation of the methyl group in sterically overcrowded compounds.
- The conformations and the ring inversions of some 8- and 10-methyl-substituted 8,9,10,11-tetrahydro-7H-cycloocta[de]naphthalenes and their 9-oxo derivatives.
- Nuclear magnetic resonance study of exchanging systems. X. Rotational barriers to trans-cis isomerization in esters.
- Photochemical ring-expansion reaction of 1,2-benzisothiazolinones.
- Crystal and molecular structures of tetraisopropyl 1,1'-(1,8-naphthylene)-bis[1H-1,2,3-triazole-4,5-dicarboxylate] and diisopropyl 1-(1-naphthyl)-1H-1,2,3-triazole-4,5-dicarboxylate.