منابع مشابه
Model studies in heterogeneous catalysis.
I review a concept that models heterogeneous catalysis based on a surface-science approach. It is shown that models catching part of the complexity of the real system, which is connected with the finite size of active components and the flexibility of the arrangement of atoms in the active component, play an important part in determining the activity and selectivity of the system. I have chosen...
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Examples of enantioselective catalysts, including homogeneous supported catalysts and biphasic liquid/liquid, are described and compared. In the case of asymmetric hydride transfer, polythiourea was proven to be more efficient for ruthenium-catalyzed reduction of aryl ketones, although the iridium complexes gave rise to higher ee when using amino sulfonamide bound to a polystyrene matrix. In th...
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2.7. Redox Deprotections 221 3. Thiol Protecting Groups 223 4. Carboxy Protecting Groups 223 4.1. Protection 224 4.2. Deprotection 226 5. Carbonyl Protecting Groups 227 5.1. Acetals 227 5.1.1. Protection 227 5.1.2. Deprotection 231 5.2. Dithioacetals 233 5.2.1. Protection 233 5.2.2. Deprotection 235 5.3. 1,3-Oxathiolanes 237 5.4. 1,1-Diacetates (Acylals) 238 5.4.1. Protection 238 5.4.2. Deprote...
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Sepsis is the most common cause of neonatal mortality. As per National Neonatal-Perinatal Database (NNPD), 2002-2003, the incidence of neonatal sepsis in India was 30 per 1000 live births. Signs and symptoms of sepsis are nonspecific; therefore empirical antimicrobial therapy is promptly initiated after obtaining appropriate cultures. The early manifestations of neonatal sepsis are vague and il...
متن کاملIn situ NMR spectroscopy in heterogeneous catalysis
New experimental techniques of in situ MAS NMR spectroscopy introduced in the past decade made this analytical method to a useful tool for the study of heterogeneously catalyzed reactions. Batch and flow techniques were applied to study reactions catalyzed by basic and acidic solids. The present review introduces into in situ MAS NMR investigations of transition states, e.g., via the H/D exchan...
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ژورنال
عنوان ژورنال: Platinum Metals Review
سال: 2005
ISSN: 0032-1400,1471-0676
DOI: 10.1595/147106705x73667