- Proton Resonance Spectra and Substituent-Induced Chemical Shifts of 3-Halocamphors
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Complete signal assignments of high-field 1H NMR spectra for 3-halosubstituted camphors (endo and exo) are presented, allowing a refinement of a previous analysis for the chloro (endo and exo) and bromo (endo) derivatives.In addition, still unpublished data for the dichloro and exo-fluoro derivatives and for three new compounds (endo-fluoro, endo- and exo-iodo), in addition to a revised assignment of the camphor parent molecule, are reported.The precise substituent-induced chemical shifts (SCS) obtained for these difunctional systems are examined on the basis of well known transmission mechanisms aided by correlations with steric and electronic parameters, and taking into account SCS data from monohaloalkanes and the calculated molecular geometry data (using the AM1 method). - Keywords: 1H NMR 3-Halocamphors COSY-45 Molecular geometries Substituent-induced chemical shifts
- Kaiser, C. R.,Rittner, R.,Basso, E. A.
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- A phenanthroline-derived ligand and its complexation with Pd(II): From ligand design, synthesis and Pd(II) complexes structures to its application
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A novel phenanthroline-derived bis-opened-triazine ligand for selective complexation with Pd(ii) over 19 typical metals from HNO3 media was designed based on cavity modulation strategy. Structures of the three species of the Pd(ii) complexes of with the ligand were elucidated by 1H NMR titration isothermal titration calorimetry (ITC) and density functional theory (DFT) studies. ITC test and binding energy calculations demonstrated that the asymmetrical 1:1 Pd(ii)-ligand complex with a monodentate nitrate anion was the most stable among these three species of the Pd(ii) complexes. The excellent kinetics of Pd(ii) extraction with the ligand is due to its optimal conformation completely ready for metal ligation. The enhanced special extraction selectivity and fast extraction rate towards Pd(ii) achieved by the phenanthroline-derived ligand demonstrated that the effective separation of some radionuclides with smaller radius in HLW through cavity modulation strategy is a feasible approach.
- Xu, Lei,Zhang, Anyun,Lu, Yanchao,Yang, Hua,Liu, Ziyang
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p. 99859 - 99866
(2016/11/09)
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- New chiral cyclopalladated complexes based on the pinane and bornane imines
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2α-Hydroxypinan-3-one imino derivatives react with lithium tetrachloropalladate to form palladacycles, while similar bornane derivative undergo cyclopalladation only when treated with palladium acetate.
- Kuchin,Gur'eva,Frolova,Alekseev,Zalevskaya
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p. 745 - 750
(2014/01/23)
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- Catalyst-free selective oxidation of alcohols to carbonyls using trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane as an efficient oxidant
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A simple and efficient method for the selective oxidation of alcohols to ketones using trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane at room temperature is developed. The reactions were smoothly proceeded under catalyst-free conditions to provide ketones in quantitative yields within short reaction times. Also, this method is compatible with many functional groups including aldehydes, olefins, halogens, amines and esters. Graphical Abstract: [Figure not available: see fulltext.]
- Azarifar, Davood,Najminejad, Zohreh,Khosravi, Kaveh
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p. 979 - 983
(2013/09/23)
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- REACTIVITY OF 3-BROMOCAMPHOR AND 3-BROMOISOCAMPHANONE UNDER THE CONDITIONS OF THE RITTER REACTION
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The bromination of camphor and isocamphanone yield, respectively, 3-endo- and 3-exo-bromo ketones.Under the conditions of the Ritter reaction 3-bromocamphor does not react with nitriles, while 3-isocamphanone is selectively converted into the corresponding N,N'-diacyl-3-bromo-2,2-gem-diamino-5,5,6-trimethylbicycloheptanes.
- Koval'skaya, S. S.,Kozlov, N. G.,Zyryanov, V. A.
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p. 722 - 726
(2007/10/02)
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- Insensitivity to Conformational Changes in Potassium Bromate Oxidation of Steroidal Alcohols and Sterically Hindered 2-Adamantanol, Dicyclohexylmethanol and Borneol
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The kinetics of potassium bromate oxidation of the title steroidal and highly hindered alcohols in the presence of Hg(OAc)2 proceed at comparable rates, in contrast to Cr(VI) oxidation.Unlike Cr(VI) oxidations, α-C-H bond cleavage does not occur in a slow step in the title oxidation reactions and hence it is not subjected to steric influences of conformers.
- Narayanan, S.,Srinivasan, Vangalur S.
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p. 396 - 398
(2007/10/02)
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- Correlation of nuclear magnetic resonance spectra and structure of trans-camphane-2,3-diols
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Evidence is provided to demonstrate that a recent correction in the published nmr spectra of trans-camphane-2,3-diols is unjustified
- Allen, M. S.,Hutchinson, J. H.,Money, T.
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p. 2707 - 2708
(2007/10/02)
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