排序方式: 共有29条查询结果,搜索用时 31 毫秒
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G. Charlot J. Badoz-Lambling P. Homsi V. Plichon J.P. Saget A. Kerouanton 《Journal of Electroanalytical Chemistry》1977,75(2):665-675
Results obtained by electrochemistry in molten cryolite and sodium tetrafluoroaluminate are related to the following points: self-dissociation constant of the melts, classification of fluoride-ion donors/acceptors, electrooxidation of so-called “dissolved” aluminium, anode effect, redox behaviour of phosphorous (V), boron (III+), and some metals, titration of alumina by CrF3. 相似文献
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G. Laurence F. Simondet P. Saget 《Applied Physics A: Materials Science & Processing》1979,19(1):63-70
Auger analysis and reflection high energy electron diffraction (RHEED) have been used to study the UHV thermal cleaning procedure
of different chemically treated (001) GaAs surfaces when heated in ultra high vacuum. It is shown that the ultimate surface
composition of the substrate critically depends on the nature and the thickness of the oxide layer formed during chemical
treatment. The oxygen removal mechanism has been studied and a comparative analysis of AES and RHEED observations has been
drawn. A low residual carbon coverage cleaning procedure is fully investigated and it results that a carbon coverage as low
as ∼6×10−2 monolayer induces surface faceting by heating the GaAs substrate at temperatures higher than 570°C. A (001) GaAs surface
heated in an arsenic flux up to 570°C is As-stabilized and (411) facets appear at a temperature ranged between 575 and 585°C. 相似文献
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Catalytic Asymmetric Mannich Reactions with Fluorinated Aromatic Ketones: Efficient Access to Chiral β‐Fluoroamines
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Barry M. Trost Tanguy Saget Andreas Lerchen Chao‐I Hung 《Angewandte Chemie (International ed. in English)》2016,55(2):781-784
Reported herein is a Zn/Prophenol‐catalyzed Mannich reaction using fluorinated aromatic ketones as nucleophilic partners for the direct enantio‐ and diastereoselective construction of β‐fluoroamine motifs featuring a fluorinated tetrasubstituted carbon. The reaction can be run on a gram scale with a low catalyst loading without impacting its efficiency. Moreover, a related aldol reaction was also developed. Together, these reactions provide a new approach for the preparation of pharmaceutically relevant products possessing tetrasubstituted C? F centers. 相似文献
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Seiser T Saget T Tran DN Cramer N 《Angewandte Chemie (International ed. in English)》2011,50(34):7740-7752
The exploitation of ring strain as a driving force to facilitate chemical reactions is a well‐appreciated principle in organic chemistry. The most prominent and most frequently used compound classes in this respect are oxiranes and cyclopropanes. For rather a long time, cyclobutanes lagged behind these three‐membered‐ring compounds in their development as reactive substrates, but during the past decade an increasing number of useful reactions of four‐membered‐ring substrates have emerged. This Minireview examines corresponding catalytic reactions ranging from Lewis or Brønsted acid catalyzed processes to enzymatic reactions. The main focus is placed on transition‐metal‐catalyzed C C bond‐insertion and β‐carbon‐elimination processes, which enable exciting downstream reactions that deliver versatile building blocks. 相似文献
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