Enantioselectivity and catalyst morphology: step and terrace site contributions to rate and enantiomeric excess in Pt-catalysed ethyl pyruvate hydrogenation

2005 ◽  
Vol 234 (1) ◽  
pp. 230-239 ◽  
Author(s):  
D JENKINS ◽  
A ALABDULRAHMAN ◽  
G ATTARD ◽  
K GRIFFIN ◽  
P JOHNSTON ◽  
...  
1998 ◽  
Vol 179 (2) ◽  
pp. 335-338 ◽  
Author(s):  
Frank M. Bohnen ◽  
Agnes Gamez ◽  
Donna G. Blackmond

2007 ◽  
Vol 126 (2-3) ◽  
pp. 103-109 ◽  
Author(s):  
Blanka Toukoniitty ◽  
Oriane Roche ◽  
Jyri-Pekka Mikkola ◽  
Esa Toukoniitty ◽  
Fredrik Klingstedt ◽  
...  

2020 ◽  
Author(s):  
Tomas Hardwick ◽  
Rossana Cicala ◽  
Nisar Ahmed

<p>Many chiral compounds have become of great interest to the pharmaceutical industry as they possess various biological activities. Concurrently, the concept of “memory of chirality” has been proven as a powerful tool in asymmetric synthesis, while flow chemistry has begun its rise as a new enabling technology to add to the ever increasing arsenal of techniques available to the modern day chemist. Here, we have employed a new simple electrochemical microreactor design to oxidise an L-proline derivative at room temperature in continuous flow. Flow performed in microreactors offers up a number of benefits allowing reactions to be performed in a more convenient and safer manner, and even allow electrochemical reactions to take place without a supporting electrolyte due to a very short interelectrode distance. By the comparison of electrochemical oxidations in batch and flow we have found that continuous flow is able to outperform its batch counterpart, producing a good yield (71%) and a better enantiomeric excess (64%) than batch with a 98% conversion. We have, therefore, provided evidence that continuous flow chemistry has the potential to act as a new enabling technology to replace some aspects of conventional batch processes. </p>


2019 ◽  
Author(s):  
John Montgomery ◽  
Alexander W. Rand

A new method to access alpha-arylated benzamides has been enabled by metallaphotoredox catalysis. This system allows for non-directed C–H functionalization of N-alkyl benzamides using a dual nickel/iridium catalytic system to form tertiary stereocenters in good enantiomeric excess and moderate yields. This reaction shows excellent functional group compatibility and can be performed using a number of sterically and electronically different aryl bromides and secondary benzamides.


2019 ◽  
Author(s):  
John Montgomery ◽  
Alexander W. Rand

A new method to access alpha-arylated benzamides has been enabled by metallaphotoredox catalysis. This system allows for non-directed C–H functionalization of N-alkyl benzamides using a dual nickel/iridium catalytic system to form tertiary stereocenters in good enantiomeric excess and moderate yields. This reaction shows excellent functional group compatibility and can be performed using a number of sterically and electronically different aryl bromides and secondary benzamides.


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