Biomimetic Cascade Cyclizations of Terpenoid PolyalkenesviaPhotoinduced Electron Transfer. Long-Distance Asymmetric Induction by a Chiral Auxiliary

1997 ◽  
Vol 119 (5) ◽  
pp. 1129-1130 ◽  
Author(s):  
Christoph Heinemann ◽  
Martin Demuth
Keyword(s):  
Electron Transfer ◽  
Chiral Auxiliary ◽  
Asymmetric Induction ◽  
Long Distance ◽  
Cascade Cyclizations

scholarly journals Long-distance electron transfer in a filamentous Gram-positive bacterium

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yonggang Yang ◽  
Zegao Wang ◽  
Cuifen Gan ◽  
Lasse Hyldgaard Klausen ◽  
Robin Bonné ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Microbial Fuel Cells ◽  
Extracellular Electron Transfer ◽  
Gram Negative Bacteria ◽  
Positive Bacterium ◽  
Long Distance ◽  
Gram Positive ◽  
Gram Negative ◽  
Force Microscopy ◽  
Cell Envelopes

AbstractLong-distance extracellular electron transfer has been observed in Gram-negative bacteria and plays roles in both natural and engineering processes. The electron transfer can be mediated by conductive protein appendages (in short unicellular bacteria such as Geobacter species) or by conductive cell envelopes (in filamentous multicellular cable bacteria). Here we show that Lysinibacillus varians GY32, a filamentous unicellular Gram-positive bacterium, is capable of bidirectional extracellular electron transfer. In microbial fuel cells, L. varians can form centimetre-range conductive cellular networks and, when grown on graphite electrodes, the cells can reach a remarkable length of 1.08 mm. Atomic force microscopy and microelectrode analyses suggest that the conductivity is linked to pili-like protein appendages. Our results show that long-distance electron transfer is not limited to Gram-negative bacteria.

On the relationship between long-distance and heterogeneous electron transfer in electrode-grown Geobacter sulfurreducens biofilms

2018 ◽  
Vol 119 ◽  
pp. 111-118 ◽  
Author(s):  
Matthew D. Yates ◽  
Brian J. Eddie ◽  
Nikolai Lebedev ◽  
Nicholas J. Kotloski ◽  
Sarah M. Strycharz-Glaven ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Geobacter Sulfurreducens ◽  
Long Distance ◽  
Heterogeneous Electron Transfer ◽  
The Relationship

Photochemistry of 9-methylbicyclo[3.3.1]nonyl aryl ketones — A novel 1,5-disproportionation of 1,4-hydroxy biradicals and asymmetric induction using the solid-state ionic chiral auxiliary method

2005 ◽  
Vol 83 (9) ◽  
pp. 1460-1472 ◽  
Author(s):  
Shuang Chen ◽  
Brian O Patrick ◽  
John R Scheffer
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Solid State Ionic ◽  
Chiral Auxiliary ◽  
Asymmetric Induction ◽  
X Ray Crystallography ◽  
Aryl Ketones ◽  
Hydroxy Biradicals ◽  
Phenyl Ketones ◽  
State Ionic

A novel 1,5-disproportionation reaction has been discovered for 1,4-hydroxy biradicals derived from the photolysis of 9-methylbicyclo[3.3.1]nonyl phenyl ketones (1), which undergo mainly Yang cyclization both in solution and the solid state. By applying the solid-state ionic chiral auxiliary method of asymmetric synthesis to the Yang cyclization, enantiomeric excesses as high as 95% were achieved at high reaction conversions. The origin of the reaction selectivity is discussed with the help of X-ray crystallography. In addition, the solid-state photoreaction of ketone 1b was found to occur in a single crystal-to-single crystal fashion.Key words: photochemistry, 1,4-hydroxy biradical, disproportionation, asymmetric induction, ionic chiral auxiliary, single crystal-to-single crystal reaction.

Long-distance photoassisted electron transfer

1990 ◽  
Vol 42 (9) ◽  
pp. 5649-5656
Author(s):  
Victor R. Blok ◽  
Gennady M. Krochik
Keyword(s):  
Electron Transfer ◽  
Long Distance
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