Continous asymmetric ketone reduction processes with tailor-made microorganisms

2007 ◽  
Vol 131 (2) ◽  
pp. S95-S96 ◽  
Author(s):  
Kirsten Schroer ◽  
Eva Tacha ◽  
Stefanie Bringer-Meyer ◽  
Werner Hummel ◽  
Thomas Daussmann ◽  
...  
2007 ◽  
Vol 132 (4) ◽  
pp. 438-444 ◽  
Author(s):  
Kirsten Schroer ◽  
Ursula Mackfeld ◽  
Ivy Ai Wei Tan ◽  
Christian Wandrey ◽  
Florian Heuser ◽  
...  

2019 ◽  
Author(s):  
Timothy Newhouse ◽  
Aneta Turlik ◽  
Yifeng Chen ◽  
Anthony Scruse

<div> <p>The total synthesis of principinol D, a rearranged kaurane diterpenoid, is reported. This grayanane natural product is constructed via a convergent fragment coupling approach, wherein the central 7-membered ring is synthesized at a late stage. The bicyclo[3.2.1]octane fragment is accessed by a Ni-catalyzed α-vinylation reaction. Strategic reductions include a diastereoselective SmI<sub>2</sub>-mediated ketone reduction with PhSH and a new protocol for selective ester reduction in the presence of ketones. The convergent strategy reported herein may be an entry point to the larger class of kaurane diterpenoids.</p> </div>


Nanoscale ◽  
2021 ◽  
Author(s):  
Haibin Ma ◽  
Zhiwen Chen ◽  
Zhili Wang

Electrochemical reduction of nitrogen (N2) to ammonia (NH3) has attracted attention as an emerging alternative to the traditional Haber-Bosch process to synthesize NH3. Unfortunately, currently electrocatalytic N2 reduction processes are...


2020 ◽  
Vol 56 (4) ◽  
pp. 711-739
Author(s):  
Eva Maria Luef ◽  
Jong-Seung Sun

Abstract The frequency with which a word appears in the lexicon has implications for its pronunciation. Numerous studies have shown that high-frequency lemma are characterized by more phonetic reduction than lower-frequency lemma. These findings have proven to be particularly useful in the study of homophones where frequency-related reduction processes can give insights into lexical access theories. The majority of research on homophones and frequency effects has focused on heterographic and semantically unrelated homophones (e.g., English time – thyme) or investigated zero-derived homophones (e.g., English the cut, noun – to cut, verb). Here, zero inflection in German pluralization (e.g., ein Würfel ‘one die’– zwei Würfel ‘two dice’) was investigated to determine if and how frequency effects impact on the acoustic realization of the homophonous singular-plural word pairs. The findings indicate that the number-specified wordforms show acoustic variation related to wordform frequency and the relative frequency of the singular to plural inflected forms. Results differ for durations of wordforms, stem vowels, and final phonemes. Our findings have implications for lexical access theories and can inform about ‘frequency inheritance’ across the singular and plural homophones of the zero-inflected plurals.


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