Highly enantioselective synthesis via dynamic kinetic resolution under transfer hydrogenation using Ru(η6-arene)-N-perfluorosulfonyl-1,2-diamine catalysts: a first insight into the relationship of the ligand’s pKa and the catalyst activity

2001 ◽  
pp. 2572-2573 ◽  
Author(s):  
Barbara Mohar ◽  
Alain Valleix ◽  
Jean-Roger Desmurs ◽  
Marc Felemez ◽  
Alain Wagner ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
Catalyst Activity ◽  
Enantioselective Synthesis ◽  
Transfer Hydrogenation ◽  
Dynamic Kinetic Resolution ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Enantioselective synthesis of chiral multicyclic γ-lactones via dynamic kinetic resolution of racemic γ-keto carboxylic acids

2020 ◽  
Vol 7 (1) ◽  
pp. 104-108 ◽  
Author(s):  
Zhichao Xiong ◽  
Jiangyan Tian ◽  
Peng Xue ◽  
Xumu Zhang ◽  
Hui Lv
Keyword(s):  
Carboxylic Acids ◽  
Kinetic Resolution ◽  
Enantioselective Synthesis ◽  
Transfer Hydrogenation ◽  
Asymmetric Transfer Hydrogenation ◽  
Dynamic Kinetic Resolution ◽  
High Yields

Ru-Catalyzed asymmetric transfer hydrogenation of γ-keto carboxylic acids has been achieved, affording chiral multicyclic γ-lactones in high yields with excellent diastereo- and enantioselectivities.

Transfer Hydrogenation of α-Branched Ketimines: Enantioselective Synthesis of Cycloalkylaminesvia Dynamic Kinetic Resolution

2005 ◽  
Vol 347 (15) ◽  
pp. 1917-1920 ◽  
Author(s):  
Abel Ros ◽  
Antonio Magriz ◽  
Hansjörg Dietrich ◽  
Mark Ford ◽  
Rosario Fernández ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
Enantioselective Synthesis ◽  
Transfer Hydrogenation ◽  
Dynamic Kinetic Resolution

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

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