Chem. Soc. Rev., 2015, 44, 2202--2220 - RSC Publishing
... Nyhlén and Privalov a few years ago.30 Just recently, this gap was closed by the groups of Stephan31 and Ashley.32 Stephan and co-workers had already found that 1,1-diphenylethylene is reduced to the corresponding alkane when treated with dihydrogen in the presence of catalytic amounts of B(C6F5)3 ...
... Nyhlén and Privalov a few years ago.30 Just recently, this gap was closed by the groups of Stephan31 and Ashley.32 Stephan and co-workers had already found that 1,1-diphenylethylene is reduced to the corresponding alkane when treated with dihydrogen in the presence of catalytic amounts of B(C6F5)3 ...
HYBRID MULTIDENTATE PHOSPHINE
... metals (Pt, Pd, Cu, Rh and Au) has been investigated in a comprehensive spectroscopis study. Single crystal X-ray analysis has been conducted at suitable junctures within the project. A surprising finding was that some solution-state structures were found to be different when studied in the solid st ...
... metals (Pt, Pd, Cu, Rh and Au) has been investigated in a comprehensive spectroscopis study. Single crystal X-ray analysis has been conducted at suitable junctures within the project. A surprising finding was that some solution-state structures were found to be different when studied in the solid st ...
Kinetic Modeling Of Methanol Synthesis From Carbon Monoxide
... in POLYMATH. Another aim was to use the results from the best fit model to explain some aspects and resolve some questions related to methanol synthesis kinetics. Two statistically sound kinetic models were chosen from literature based on their goodness of fit to the respective kinetic data. POLYMAT ...
... in POLYMATH. Another aim was to use the results from the best fit model to explain some aspects and resolve some questions related to methanol synthesis kinetics. Two statistically sound kinetic models were chosen from literature based on their goodness of fit to the respective kinetic data. POLYMAT ...
Full-Text PDF
... While all these methods provide a viable alternative in the acetylation of alcohols, long reaction times, high temperature requirements, and high catalyst loading required in some of these protocols has necessitated the need for the development of a new method of protecting hydroxyl groups to comple ...
... While all these methods provide a viable alternative in the acetylation of alcohols, long reaction times, high temperature requirements, and high catalyst loading required in some of these protocols has necessitated the need for the development of a new method of protecting hydroxyl groups to comple ...
Ketones and Aldehydes Reading: Wade chapter 18, sections 18
... Dipole-dipole interactions are the main intermolecular force holding ketones and aldehydes in the liquid phase. The dipole-dipole interaction is strong because of the high dipole moment attributable to the carbonyl group, giving ketones and aldehydes higher boiling points than hydrocarbons. However, ...
... Dipole-dipole interactions are the main intermolecular force holding ketones and aldehydes in the liquid phase. The dipole-dipole interaction is strong because of the high dipole moment attributable to the carbonyl group, giving ketones and aldehydes higher boiling points than hydrocarbons. However, ...
Rh(acac)(CO)(PR1R2R3) - University of the Free State
... advantageous combination of ligand modification with the transition from cobalt to rhodium as catalyst metal. This led to the development of processes which operate under milder reaction conditions and used highly active catalysts with excellent selectivity for the formation of the desired products. ...
... advantageous combination of ligand modification with the transition from cobalt to rhodium as catalyst metal. This led to the development of processes which operate under milder reaction conditions and used highly active catalysts with excellent selectivity for the formation of the desired products. ...
Catalytic decomposition of N2O over Rh/Zn–Al2O3 catalysts
... shows high activity, because oxygen desorption property is improved and Rh0 species is stabilized.30 Kim and co-workers reported that Rh/Ce–Al2O3 is more active than Rh/Al2O3, due to increased surface area and improved reducibility of Rh species.31 It has been reported that spinel phase has a strong ...
... shows high activity, because oxygen desorption property is improved and Rh0 species is stabilized.30 Kim and co-workers reported that Rh/Ce–Al2O3 is more active than Rh/Al2O3, due to increased surface area and improved reducibility of Rh species.31 It has been reported that spinel phase has a strong ...
PDF - Nanyang Technological University
... For reactions that were carried out in DMF (Table 1, entry 6), the low ee values were largely caused by the racemic background reaction that is not catalyzed by the amine. To suppress the racemic background reaction, we screened solvents for this cooperative system with catalyst C (Table 1, entries ...
... For reactions that were carried out in DMF (Table 1, entry 6), the low ee values were largely caused by the racemic background reaction that is not catalyzed by the amine. To suppress the racemic background reaction, we screened solvents for this cooperative system with catalyst C (Table 1, entries ...
synthetic.applicatio..
... give β-amino carbonyl compounds 14 in excellent yields (Scheme 4).15,16 Use of N,N-dimethylethanolamine (DMEA) as the proton source instead of MeOH or EtOH was essential to prevent competing nucleophilic ringopening reactions. It was not necessary to activate nitrogen with an electron-withdrawing gr ...
... give β-amino carbonyl compounds 14 in excellent yields (Scheme 4).15,16 Use of N,N-dimethylethanolamine (DMEA) as the proton source instead of MeOH or EtOH was essential to prevent competing nucleophilic ringopening reactions. It was not necessary to activate nitrogen with an electron-withdrawing gr ...
Three-dimensional Arrangement Of Atoms
... Addition of HBr to a chiral alkene: reactions of a chiral reactant with an achiral reagent gives diastereomeric products which may or may not be formed in equal amounts. The intermediate carbocation is asymmetric, therefore attack of Br- from the top or bottom faces may not be equally probable. The ...
... Addition of HBr to a chiral alkene: reactions of a chiral reactant with an achiral reagent gives diastereomeric products which may or may not be formed in equal amounts. The intermediate carbocation is asymmetric, therefore attack of Br- from the top or bottom faces may not be equally probable. The ...
Group Meeting Special Topic: EJ Corey
... tetrahydropyran (THP) • More stable silyl ether than TMS and dimethylisopropylsilyl ether • First time used imidazole and DMF ...
... tetrahydropyran (THP) • More stable silyl ether than TMS and dimethylisopropylsilyl ether • First time used imidazole and DMF ...
Full-Text PDF
... studied Rh catalyzed reaction pathways exhibited singlet ground state, as ruthenium homologous mechanism [50,65–68], but differently with respect to iron [42,43]. However, here the rhodium center might be disproportionate, or lose one chloride, like Castarlenas et al. have recently demonstrated [53] ...
... studied Rh catalyzed reaction pathways exhibited singlet ground state, as ruthenium homologous mechanism [50,65–68], but differently with respect to iron [42,43]. However, here the rhodium center might be disproportionate, or lose one chloride, like Castarlenas et al. have recently demonstrated [53] ...
VITA - Trace: Tennessee Research and Creative Exchange
... one plane around a central metal atom, yet these examples mostly consist of four monodentate-NHCs or two bis-bidentate NHC ligands.12 ...
... one plane around a central metal atom, yet these examples mostly consist of four monodentate-NHCs or two bis-bidentate NHC ligands.12 ...
Chapter Seven PPT
... • Unsaturated Compounds (Less than Maximum H Atoms) • Alkenes also Referred to as Olefins • Properties Similar to those of Corresponding Alkanes • Slightly Soluble in Water • Dissolve Readily in Nonpolar or Low Polarity Solvents • Densities of Alkenes and Alkynes Less than Water ...
... • Unsaturated Compounds (Less than Maximum H Atoms) • Alkenes also Referred to as Olefins • Properties Similar to those of Corresponding Alkanes • Slightly Soluble in Water • Dissolve Readily in Nonpolar or Low Polarity Solvents • Densities of Alkenes and Alkynes Less than Water ...
Development of New Synthetic Routes to Organoboronates by Catalytic Allylic Substitution and
... for the organic transformation17-31 of aldehydes (2) affording homoallylic alcohols (3) (Scheme 1). This reaction is also a synthetic alternative to the aldol reaction31 since the homoallyl alcohol products can easily be converted to the corresponding aldol 4. Moreover, the alkene group may readily ...
... for the organic transformation17-31 of aldehydes (2) affording homoallylic alcohols (3) (Scheme 1). This reaction is also a synthetic alternative to the aldol reaction31 since the homoallyl alcohol products can easily be converted to the corresponding aldol 4. Moreover, the alkene group may readily ...
Preparation of d, l-Phenylalanine by Amidocarbonylation of Benzyl
... to further develop this reaction to make it amenable to large scale production. The process as described in the patent has several drawbacks that need to be overcome before scale-up can be attempted. Very high pressures, i.e. between 250 and 300 bar, are needed for good yields of acylated amino acid ...
... to further develop this reaction to make it amenable to large scale production. The process as described in the patent has several drawbacks that need to be overcome before scale-up can be attempted. Very high pressures, i.e. between 250 and 300 bar, are needed for good yields of acylated amino acid ...
Nickel Catalyzed Conversion of Cyclohexanol into Cyclohexylamine
... By now, great efforts have been made to find and develop a catalyst system to convert alcohol into primary amine. Homogeneous catalysts, such as Ru complexes, demonstrate high performance in converting secondary alcohol into primary amine [1–3]. However, these catalysts are either costly or difficul ...
... By now, great efforts have been made to find and develop a catalyst system to convert alcohol into primary amine. Homogeneous catalysts, such as Ru complexes, demonstrate high performance in converting secondary alcohol into primary amine [1–3]. However, these catalysts are either costly or difficul ...
SUPPORTED LIGANDS FOR METAL CATALYZED REACTIONS Rocío Marcos Escartín ISBN:
... the most important processes in modern organic chemistry.[5] Classically, the Friedel-Crafts reaction,[6] the Diels-Alder reaction[7] and reactions related to the carbonyl group, such as addition of organometallic carbon nucleophiles[8] and aldol-type reactions (Mukaiyama aldol synthesis),[9] are ca ...
... the most important processes in modern organic chemistry.[5] Classically, the Friedel-Crafts reaction,[6] the Diels-Alder reaction[7] and reactions related to the carbonyl group, such as addition of organometallic carbon nucleophiles[8] and aldol-type reactions (Mukaiyama aldol synthesis),[9] are ca ...
$doc.title
... suffix -‐yl from the root of the carboxylic acid – CH3CO: acetyl; CHO: formyl; C6H5CO: benzoyl ...
... suffix -‐yl from the root of the carboxylic acid – CH3CO: acetyl; CHO: formyl; C6H5CO: benzoyl ...
molecules
... subject of much investigation. A variety of oxygen donors like iodosylarenes, hypochlorites, alkylhydroperoxides, hydrogen peroxide and periodates have been used these transformations [1]. In fact, the majority of the studies are directed toward understanding the mechanism of the catalytic activity ...
... subject of much investigation. A variety of oxygen donors like iodosylarenes, hypochlorites, alkylhydroperoxides, hydrogen peroxide and periodates have been used these transformations [1]. In fact, the majority of the studies are directed toward understanding the mechanism of the catalytic activity ...
Electrophilic Selenium Catalysis with Electrophilic N
... reagents ArSeX (X = Cl, Br, OTf, etc.) have been developed and widely applied in routine synthesis [1–9]. In general, the introduced selenium moiety was further modified via oxidative or reductive manner leading to the formation of non-selenium-containing products. This process was not green and was ...
... reagents ArSeX (X = Cl, Br, OTf, etc.) have been developed and widely applied in routine synthesis [1–9]. In general, the introduced selenium moiety was further modified via oxidative or reductive manner leading to the formation of non-selenium-containing products. This process was not green and was ...
NICKEL(II) PINCER COMPLEXES SUPPORTED BY 2,6
... The starting material of the ligand synthesis, 2,6-dicarboxaldehye was prepared from 2,6-dimethanol pyridine through oxidation with SeO2/Dioxane (Figure 9). Then, tolualdehyde was stirred at room temperature for 5 h with 4-methylacetophenone and NaOH in EtOH/H2O to form 1,3-bis(4-tolyl)-2-propen-1-o ...
... The starting material of the ligand synthesis, 2,6-dicarboxaldehye was prepared from 2,6-dimethanol pyridine through oxidation with SeO2/Dioxane (Figure 9). Then, tolualdehyde was stirred at room temperature for 5 h with 4-methylacetophenone and NaOH in EtOH/H2O to form 1,3-bis(4-tolyl)-2-propen-1-o ...
Asymmetric hydrogenation
Asymmetric hydrogenation is a chemical reaction that adds two atoms of hydrogen preferentially to one of two faces of an unsaturated substrate molecule, such as an alkene or ketone. The selectivity derives from the manner that the substrate binds to the chiral catalysts. In jargon, this binding transmits spatial information (what chemists refer to as chirality) from the catalyst to the target, favoring the product as a single enantiomer. This enzyme-like selectivity is particularly applied to bioactive products such as pharmaceutical agents and agrochemicals.