53369-76-9Relevant academic research and scientific papers
Asymmetric Sommelet-Hauser rearrangement of N-benzylic ammonium salts
Tayama, Eiji,Kimura, Hiroshi
, p. 8869 - 8871 (2008/09/19)
(Chemical Equation Presented) [2,3] over [1,2]: The asymmetric Sommelet-Hauser rearrangement of an ammonium salt derived from N-benzylic proline-derived or N-benzylic glycine (-)-8-phenylmenthol ester is shown to proceed with remarkably high levels of stereoselectivity. The method provides unique and efficient access to optically active α-aryl amino acid derivatives.
HYDRAZONE DERIVATIVE
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Page/Page column 42, (2010/11/08)
A compound represented by the following formula (I): wherein R1 represents hydrogen, aryl which may have a substituent, a saturated or unsaturated 5- to 7-membered heterocyclic group which may have a substituent, etc.; R2 represents hydrogen, aryl which may have a substituent, a saturated or unsaturated 5- to 7-membered heterocyclic group which may have a substituent, etc.; R3 represents hydrogen, etc.; Ar represents a divalent group derived from aromatic hydrocarbon, etc.; X represents a single bond, linear or branched alkylene having from 1 to 3 carbon atoms which may have a substituent, etc.; and G represents halogen, a saturated or unsaturated 5- or 6-membered cyclic hydrocarbon group which may have a substituent, a saturated or unsaturated 5- to 7-membered heterocyclic group which may have a substituent, etc., a salt thereof or a solvate thereof; and an agent for inhibiting aggregation and/or deposition of an amyloid protein or an amyloid-like protein, which comprises the compound, a salt thereof or a solvate thereof
15N and 13C NMR studies on cyclopalladated complexes. Synthetic palladium cyanide chemistry leading to organic nitriles
Affolter, Samuel,Pregosin, Paul S.
, p. 197 - 204 (2007/10/02)
15N NMR spectroscopy has been used to determine whether the 15NO group is coordinated in the cyclopalladated nitrosoamine complex 2, PdCl and K2, 11, as well as in several platinum
Elimination Reactions of Hydrazonium Salts: Experimental and Theoretical Evidence for a Large Stereoelectronic Effect of Nitrogen
Nguyen, Minh Tho,Clarke, Leo F.,Hegarty, Anthony F.
, p. 6177 - 6183 (2007/10/02)
Elimination of trimethylamine from hydrazonium salts (8, R = Me) is promoted by base (methoxide ion in methanol).The mechanism is characterized as E2 as shown by substituent effects (ρ = +2.57), Broensted coefficients, a primary kinetic isotope effect (kH/kD = 2.10), and solvent effects.Variation in the leaving group (8, R = arylmethyl) shows that N-N bond cleavage is less well advanced in the transition state than C-H bond breaking.The elimination to give the nitrile is syn-periplanar and, using the phthalazinium salt 4 as a model for the anti elimination, an anti/syn ratio of ca. 102 is found.The reactions have been modelled using ab initio methods with the transition structures located at the HF/3-21G level and relative energies computed using the MP2/6-31G* method.Using both H2O and NH3 as model bases to induce elimination on +, the calculated energy for anti elimination is lower (in the range 11-13 kcal mol-1) than that for syn elimination.The implications of the results for the ease of formation of nitriles from aldehydes via the hydrazonium salt route are discussed.
