Silica Sulfuric Acid Promotes Aza-Michael Addition Reactions under
... performed by stirring an intimate mixture of PTEA (1.0 mmol), morpholine (1.2 mmol) and silica (240-400 mesh, 100 mg) at room temperature. No aza-Michael addition product was formed even after 24 h, which indicate that the requirement of SiO2-SO3H is key factor for the successful outcome of the reac ...
... performed by stirring an intimate mixture of PTEA (1.0 mmol), morpholine (1.2 mmol) and silica (240-400 mesh, 100 mg) at room temperature. No aza-Michael addition product was formed even after 24 h, which indicate that the requirement of SiO2-SO3H is key factor for the successful outcome of the reac ...
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... corresponding carboxylic acids including CrO3/H2SO4,2,3 TEMPO/NaClO,4,5 RuCl3/H5IO6,6 CrO3/H5IO6,7 and Co(II)/H2O2.8 However, these procedures are invariably associated with one or more disadvantages such as long reaction time, high temperature, low yields, difficulties in work up, and unpleasant to ...
... corresponding carboxylic acids including CrO3/H2SO4,2,3 TEMPO/NaClO,4,5 RuCl3/H5IO6,6 CrO3/H5IO6,7 and Co(II)/H2O2.8 However, these procedures are invariably associated with one or more disadvantages such as long reaction time, high temperature, low yields, difficulties in work up, and unpleasant to ...
친환경 촉매 Iron (III) phosphate: 실온/무용매 반응조건에서 알코올과
... Also, isoamyl acetate is a kind of flavor reagent with fruit taste. It is traditionally prepared with H2SO4 as catalyst.7 The use of H2SO4 often causes the problems such as corrosion for equipments and pollution for environment. Until now, the tried replaces include FeCl3, CuSO4, ferric tri-dodecane ...
... Also, isoamyl acetate is a kind of flavor reagent with fruit taste. It is traditionally prepared with H2SO4 as catalyst.7 The use of H2SO4 often causes the problems such as corrosion for equipments and pollution for environment. Until now, the tried replaces include FeCl3, CuSO4, ferric tri-dodecane ...
Elimination Reactions
... E1 eliminations (a two-step process involving an intermediate carbocation) E2 eliminations (a one-step process involving a concurrent abstraction of a proton, from an adjacent carbon, and extrusion of the leaving group) ...
... E1 eliminations (a two-step process involving an intermediate carbocation) E2 eliminations (a one-step process involving a concurrent abstraction of a proton, from an adjacent carbon, and extrusion of the leaving group) ...
review on fuel cell technology for valuable chemicals and energy co
... Low pollution level emissions are produced from FCs (typically one to two orders of magnitude lower). Low noise level is generated. FCs require low maintenance and exchangeable parts (mass-produced components). The efficiency of FCs can be increased by applying the cogeneration of heat with high-tem ...
... Low pollution level emissions are produced from FCs (typically one to two orders of magnitude lower). Low noise level is generated. FCs require low maintenance and exchangeable parts (mass-produced components). The efficiency of FCs can be increased by applying the cogeneration of heat with high-tem ...
Chem 30CL - Lecture 1c - UCLA Chemistry and Biochemistry
... • In 1976, E. J. Corey and D. Enders developed the SAMP and RAMP approach that uses cyclic amino acid derivatives ((S)-proline for SAMP, (R)-glutamic acid for RAMP) and hydrazones to control the stereochemistry of the product. • Below is an example for the use of SAMP in an asymmetric ...
... • In 1976, E. J. Corey and D. Enders developed the SAMP and RAMP approach that uses cyclic amino acid derivatives ((S)-proline for SAMP, (R)-glutamic acid for RAMP) and hydrazones to control the stereochemistry of the product. • Below is an example for the use of SAMP in an asymmetric ...
Small Molecule Activation Using Transfer Hydrogenation Catalysts
... equivalent of water.6 Kinetic analysis showed a second-order dependence on [1H(H)] and a firstorder dependence on [O2]. Through isotopic labeling, the reaction was found to be localized at the iridium center (kH/kD = 7.1), indicating that the amine protons (kH/kD = 1.2) have a secondary effect. The ...
... equivalent of water.6 Kinetic analysis showed a second-order dependence on [1H(H)] and a firstorder dependence on [O2]. Through isotopic labeling, the reaction was found to be localized at the iridium center (kH/kD = 7.1), indicating that the amine protons (kH/kD = 1.2) have a secondary effect. The ...