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Showing 1 to 16 of 16 for “"Phenylethylamine"”.
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Part I: Circular dichroism studies of optically active charge transfer complexes. Part II: vapor phase and solvent dependence circular dichroism studies of some terpenes, α-phenylethanol, and α-phenylethylamine
… chiral donors such as terpenes, steroids and β-phenylethylamine derivatives in methylene chloride at 27° were investigated. A new transition not attributable to either component alone, but due to a CT complex was observed. The donors investigated were: (-)-fenchone, (-)-menthone, (+)-camphor, …
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Werner clathrates with potential chiral selectivity : preliminary investigations
The structures of the Werner clathrate Ni(NCS)₂(α-phenylethylamine)₄, as host complex made from enantiomerically pure amine ligand and from the racemic mixture, as well as its clathrate with sec-butylbenzene have been determined by x-ray diffraction.
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Enantioselektive Pi-Komplexierung durch intramolekulare Chiralitätsübertragung aus CpTi-Aminosäure-Komplexen
… where L* = amino acid, lactic acid or phenylethylamine. With these complexes the possibility for the preparation of enantiomerically enriched "titanocenes" [CpCppcTiCl2], where Cppc is a prochiral cyclopentadienide, was explored. In cyclopentadienylation L* acts as a chiral auxiliary …
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Synthesis of Amphibian Alkaloids and Development of Acetaminophen Analogues
… reaction with either (R)- or (S)-1-phenylethylamine and 1-(5-methoxypyridin-3-yl)-1, 5-pentanediol was employed to generate the 2-(pyridin-3-yl)-piperidine ring system in 69-72% yield. A cis-2, 5-disubstitued pyrrolidine building block derived from (-)-Cocaine•HCl was prepared. We …
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2-substituted-1, 3-dioxan-5-ones : synthesis, reactions and synthetic applications
… from (R)- or (S)-'N'-(2,2,2-trifluoroethyl)-1-phenylethylamine. This successful outcome was a result of extensive methodological studies. The enolates reacted readily with electrophiles: reactions with aldehydes provided 'anti' aldols in modest to high selectivities in cases of lithium and …
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Stereoselective synthesis of piperidines
… purity. By switching the enantiomer of the phenylethylamine chiral protecting group used, either enantiomer of the desired piperidine could be produced at will. The second part of the thesis describes a solution-phase route to 2,6-syn substituted piperidin-4-ones xii inspired by the …
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Light-Mediated Dual Catalysis for C–N Bond Formation
… of a new transformation to generate b-phenylethylamine scaffolds, a valuable motif that is found in a range of pharmaceutically active compounds, is presented. 1,2 This was achieved through the design of a visible- light mediated dual-catalytic platform that enabled multicomponent …
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ASYMMETRIC REDUCTIONS BY CHIRAL LITHIUM-ALUMINUM HYDRIDE AND POTASSIUM-BOROHYDRIDE REAGENTS
… of n-butylamine, t-butylamine and (R)-and (S)-1-phenylethylamine with two equivalents of (S)-propylene oxide or ethylene oxide five chiral aminodiols were prepared: N-n-butyl-bis-{(S)-2-hydroxypropyl}amine (4), N-{(R)-1-phenylethyl}-bis-(2-hydroxyethyl)amine (5), …
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Studies on new approaches of chiral discrimination for chiral analysis by regression modeling of spectral data.
… a multi-functional chiral selected, (S)-(-)-1-phenylethylamine. Enantiomeric compositions of test samples of three amino acids and a carbohydrate determined using the second approach gave RMSEs of 0.006-0.025. In view of the need for micro-scale techniques in analyses such as this, a capillary …
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Separation by enclathration
… with the guests; aniline, benzylamine, 2-phenylethylamine, (S)-methylbenzylamine, (R,S)-methylbenzylamine, pyridine, 2-picoline, 3-picoline, 4-picoline, dioxane, morpholine and p-xylene. It was used in the two-component separation of aniline and benzylamine, in which the effect of a pH …
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Synthesis, structure and reactivity of chiral cyclopentadienylruthenium(II) complexes
… 2°: diethylamine, 5(-)-A^-methyl-l-phenylethylamine)in the presence of a halide abstractor are described. Various reactions anddecomplexations are discussed.The third chapter contains the synthesis and reactions of sulphur donorcomplexes (dimethyl sulphoxide, …
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Optical studies of chiral 1-substituted-2-phenylcyclohexanes
… acid, was resolved with (-)-��-phenylethylamine. VI and VII were prepared from V by treatment with thionyl chloride and reduction with lithium aluminum hydride respectively.</p> <p>Conformational analysis with NMR, including variable temperature studies on I and II, showed that …
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Spektroskopie der Neurotransmitter Tryptamin und Phenylethylamin
… the neurotransmitters tryptamine (TRA) and phenylethylamine (PEA) are investigated by means of infrared spectroscopy in different charge states (neutral, cationic and protonated). In particular, the influence of solvents is analyzed, such as the interaction of TRA and PEA with one or more …
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Identificación taxonómica y clonal de bacterias acéticas, y estudio del efecto de la nisina frente a biofilms de bacterias enológicas
… any biogenic amine (agmatine, spermidine, phenylethylamine, histamine, or putrescine) either in presence or in absence of ethanol in the culture broth. These results indicate that nisin preparations with the appropriate concentrations could inhibit undesired LAB and prevent biofilm …
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Chirale intramolekular koordinierte Alane
Several aluminum compounds Ar*AlR1R2, Ar*2AlR, and Ar*3Al (R, R1, R2 = Br, Cl, Me, tBu, Cp, and indenyl) incorporating the chiral ligand Ar* =2-[1-(S)-Me2NCH(Me)]C6H4, have been synthesized by salt metathesis reaction and have been characterized by multinuclear NMR (1H, 13C, 27Al), mass …
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GREEN CATALYTIC STRATEGIES FOR THE PRODUCTION OF BIOBASED BUILDING-BLOCKS
… and through liquid-solid titration using phenylethylamine (PEA) as a probe molecule respectively. In fact, the presence of a lower quantity and density (1 μmolPEA/m2 vs 5 μmolPEA/m2 for CuO/SiO2 A and CuO/SiO2 B respectively) of strong acid sites observed with CuO/SiO2 A in CPME could …