Excellent couplings : Recent developments in the metal‐catalyzed C? H activation of sp3 centers in an α position relative to an amine nitrogen atom are presented. Their reaction with alkenes to give alkylamines (hydroaminoalkylation) is also summarized (see general scheme).
The vast binding repertoire of the immune system has been exploited for the generation of tailor-made biological catalysts. A number of strategies have been developed to generate catalytic antibodies that carry out a wide range of reactions with exquisite specificities. The generation and characterization of these novel catalysts is not only providing new insights into the nature of biological recognition and catalysis, but may also lead to novel catalysts for applications in chemistry, biology, and medicine. 相似文献
This paper is a review of studies on aerogel synthesis and its application for catalytic uses, which have been conducted for
the past decade at the Clean Technology Research Center, Korea Institute of Science and Technology. Various organic and inorganic
aerogels employing sol–gel modifications exhibited catalytically favorable textural and chemical properties such as extremely
high porosity, high surface area, well-developed mesoporosity, good thermal stability, and high dispersion, which eventually
led to excellent performance in catalytic reactions. Reactions observed in these studies include hydrogenation, photodecomposition,
selective oxidation, complete oxidation, ammoxidation, reforming, and electrooxidation. The specific catalytic behaviors can
be explained in terms of the strong active sites-support interactions, high thermal stability, and extremely high dispersion. 相似文献
Catalytic decomposition of CCI2F2 was studied over a number of single and complex metal oxides using a fixed-bed reactor. The ZrO2–Cr2O2 catalyst exhibited the highest activity and CO2 and CCIF3 were formed at 350–450°C. Selective decomposition of CCI2F2 required the presence of both oxygen and water vapor over the catalyst. Catalytic activity gradually declined with time on stream because of the fluorination of ZrO2. Treatment of the catalyst with both oxygen and water vapor promoted the removal of fluoride ions in sub-surface layers of the catalyst, which is effective for the recovery of the activity. CCI2F2 was decomposed at 300–450°C over AIPO4. No fluorination of the AIPO4 catalyst took place after the reaction for 1000 h. CH2FCF3, an alternative CFC, was completely decomposed over the mixed catalyst of Ce promoted AIPO4 and Cr2O3 at 400–500°C. Catalytic decomposition is a rational method for destruction of used CFCs. 相似文献
We have developed a catalytic method for the hydroalkylation of allenes using alkyl triflates as electrophiles and silane as a hydride source. The reaction has an excellent substrate scope and is compatible with a wide range of functional groups, including esters, aryl halides, aryl boronic esters, sulfonamides, alkyl tosylates, and alkyl bromides. We found evidence for a reaction mechanism that involves unusual dinuclear copper ally complexes as catalytic intermediates. The unusual structure of these complexes provides a rationale for their unexpected reactivity. 相似文献
Phosphorylation of α-polyfluoroalkylbenzyl alcohols by an excess of phenylphosphonic dichloride in the presence of Mg or CaCl2 as the catalyst givesO-(α-polyfluoroalkylbenzyl) phenylphosphonochloridates (63–79% yield). The reaction proceeds stereoselectivity, and the phosphonochloridates
obtained are mixtures of two diastereomers with predominance (approximately by 10%) of one of them.
For Part 15, see Ref. 1.
Deceased.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1776–1779, September, 1998. 相似文献