Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

EPOXIDE HYDROLASES --- EPOXIDES --- ENANTIOMERS --- EPOXIDE HYDROLASES --- EPOXIDES --- ENANTIOMERS

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

The synthesis of enantiopure organic compounds is a key issue for several applications in pharmacology, food chemistry, agricultural chemistry, perfumery, materials science and other industrial sectors. Nowadays, asymmetric catalysis is undoubtedly the most important tool to achieve this goal. This technology, in fact, enables the production of large amounts of enantiomerically enriched compounds, employing relatively small quantities of chiral enantiopure catalysts, which is exactly what is accomplished by enzymes in nature. Since the pioneering works of Noyori, Knowles and Sharpless, which later earned them the Nobel Prize in Chemistry, asymmetric catalysis has experienced a rapid and relentless development in the last fifty years. The tremendous expansion of enantioselective transformations, the design of novel and more efficient organometallic and organic catalysts, the development of sophisticated bioreactors and cell factories, are just some of the elements responsible for such growth. However, new challenges of asymmetric catalysis are devoted to enhancing the process’s sustainability, by the introduction of recyclable and low-cost catalysts, and the use of renewable starting materials and energy source. This book provides an overview of some of these development directions and comprises a collection of review papers and a research article authored by renowned researchers actively involved in this field. The topics covered by the review papers are photoredox-catalyzed reactions of imines, asymmetric catalytic electrosynthesis, cooperative catalysis of chiral N-heterocyclic carbenes and Lewis acid, and asymmetric ring-opening reactions of epoxides catalyzed by metal–salen complexes. The research article presents a proline-catalyzed aldol reaction in water–methanol solvent mixture.

Research & information: general --- N-heterocyclic carbenes (NHC) --- Lewis acid --- cooperative catalysis --- asymmetric synthesis --- umpolung --- amines --- imines --- photoredox catalysis --- radical additions --- radical-radical couplings --- stereoselectivity --- umpolung chemistry --- visible light --- proline --- organocatalysis --- asymmetric aldol reaction --- methanol/water mixtures --- sustainability --- asymmetric catalysis --- salen complexes --- ring-opening --- epoxide --- kinetic resolution --- organic electrosynthesis --- electrochemistry --- enantioselectivity --- transition-metal catalysis --- N-heterocyclic carbenes (NHC) --- Lewis acid --- cooperative catalysis --- asymmetric synthesis --- umpolung --- amines --- imines --- photoredox catalysis --- radical additions --- radical-radical couplings --- stereoselectivity --- umpolung chemistry --- visible light --- proline --- organocatalysis --- asymmetric aldol reaction --- methanol/water mixtures --- sustainability --- asymmetric catalysis --- salen complexes --- ring-opening --- epoxide --- kinetic resolution --- organic electrosynthesis --- electrochemistry --- enantioselectivity --- transition-metal catalysis

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

The synthesis of enantiopure organic compounds is a key issue for several applications in pharmacology, food chemistry, agricultural chemistry, perfumery, materials science and other industrial sectors. Nowadays, asymmetric catalysis is undoubtedly the most important tool to achieve this goal. This technology, in fact, enables the production of large amounts of enantiomerically enriched compounds, employing relatively small quantities of chiral enantiopure catalysts, which is exactly what is accomplished by enzymes in nature. Since the pioneering works of Noyori, Knowles and Sharpless, which later earned them the Nobel Prize in Chemistry, asymmetric catalysis has experienced a rapid and relentless development in the last fifty years. The tremendous expansion of enantioselective transformations, the design of novel and more efficient organometallic and organic catalysts, the development of sophisticated bioreactors and cell factories, are just some of the elements responsible for such growth. However, new challenges of asymmetric catalysis are devoted to enhancing the process’s sustainability, by the introduction of recyclable and low-cost catalysts, and the use of renewable starting materials and energy source. This book provides an overview of some of these development directions and comprises a collection of review papers and a research article authored by renowned researchers actively involved in this field. The topics covered by the review papers are photoredox-catalyzed reactions of imines, asymmetric catalytic electrosynthesis, cooperative catalysis of chiral N-heterocyclic carbenes and Lewis acid, and asymmetric ring-opening reactions of epoxides catalyzed by metal–salen complexes. The research article presents a proline-catalyzed aldol reaction in water–methanol solvent mixture.

Research & information: general --- N-heterocyclic carbenes (NHC) --- Lewis acid --- cooperative catalysis --- asymmetric synthesis --- umpolung --- amines --- imines --- photoredox catalysis --- radical additions --- radical–radical couplings --- stereoselectivity --- umpolung chemistry --- visible light --- proline --- organocatalysis --- asymmetric aldol reaction --- methanol/water mixtures --- sustainability --- asymmetric catalysis --- salen complexes --- ring-opening --- epoxide --- kinetic resolution --- organic electrosynthesis --- electrochemistry --- enantioselectivity --- transition-metal catalysis --- n/a --- radical-radical couplings

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This Special Issue aims to highlight the dual potential of novel biocatalytic processes, where the first part is dedicated to waste valorization for the production of high value products, while the second part is focused on the detoxification of pollutants. Several examples of microbial systems employed for the valorization of waste streams derived by the forest, agricultural, and food industries or the use of whole-cell or enzyme approaches for the removal of nitrogen or dyes from industrial wastewaters are provided. Last but not least, an example of the utilization of polyhydroxyalkanoates (PHAs) was highlighted for the production of fatty acids, which were used for the enzymatic synthesis of sugar esters with antimicrobial properties.

Technology: general issues --- mixotrophic --- heterotrophic --- lipids --- fatty acid methyl esters --- dairy wastewater --- birch hydrolysate --- green algae --- Coelastrella --- Chlorella --- DyP peroxidase --- oxidoreductase --- reactive dye --- decolorization --- biopolymers --- medium chain length polyhydroxyalkanoates (PHA) --- hydrolysed waste cooking oil --- Pseudomonas putida KT2440 --- biocatalysis --- bioprocess --- polyhydroxyalkanoate --- (R)-3-hydroxyacids --- sugar esters --- antimicrobial --- anammox --- immobilization --- wastewater treatment --- polyvinyl alcohol --- olive mill waste --- lignocellulosic residues --- Ganoderma lucidum --- Pleurotus ostreatus --- medicinal mushrooms --- glucan --- prebiotic --- Lactobacillus --- Bifidobacterium --- waste valorization --- laccase --- genome-mining --- heterologous expression --- Pseudomonas --- non-digestible oligosaccharides --- Celluclast® --- cellobiose --- conduritol-B-epoxide --- lignocellulose enzyme hydrolysis --- n/a

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Layered double hydroxides (LDHs), also known as two-dimensional anionic clays, as well as the derived materials, including hybrids, nanocomposites, mixed oxides, and supported metals, have been highlighted as outstanding heterogeneous catalysts with unlimited applications in various processes involving both acid–base (addition, alkylation, acylation, decarboxylation, etc.) and redox (oxidation, reduction, dehydrogenation, etc.) mechanisms. This is mainly due to their flexibility in chemical composition, allowing the fine tuning of the nature of the active sites and the control of the balance between them. Additionally, LDHs display a large anion exchange capacity and the possibility to modify their interlayer space, constraining the size and type of reactants entering in the interlamellar space. Furthermore, their easy and economic synthesis, with high levels of purity and efficiency, at both the laboratory and industrial scales, make LDHs and their derived materials excellent solid catalysts. This Special Issue collects original research papers, reviews, and commentaries focused on the catalytic applications of these remarkable materials.

layered double hydroxides (LDH) --- polyoxometalates (POM) --- catalytic materials --- Michael addition --- cobalt-based LDHs --- ultrasonic irradiation --- synergistic effect --- photocatalysis --- nitrophenol degradation --- Zn,Al-hydrotalcite --- ZnO dispersed on alumina --- reusability --- layered double hydroxide --- LDH --- catalytic oxidation --- ethanol --- toluene --- VOC --- photocatalysts --- Cu electrodes --- diazo dyes --- electrocatalysts --- layer double hydroxides --- photoelectrochemical degradation --- hydrotalcites --- mixed oxides --- aldol condensation --- basic catalysts --- exfoliation --- nanosheets --- oxidation --- layered double hydroxides --- base catalysts --- epoxide --- formaldehyde --- oxidation removal --- BiOCl --- manganese --- biodiesel --- transesterification --- hydrothermal --- nickel --- aluminum --- solid base --- structured catalyst --- ethanol steam reforming --- aluminum lathe waste strips --- Ni nanoparticle --- mechano-chemical/co-precipitation synthesis --- organic alkalis (tetramethylammonium hydroxide) --- memory effect --- Claisen-Schmidt condensation --- self-cyclohexanone condensation --- n/a