Conversion of an electron-rich triple bond to a double bond by oxidative addition of diphenyl diselenide to Re2Cl4(.mu.-dppm)2. Preparation and characterization of Re2Cl4(.mu.-SePh)2(.mu.-dppm)2 (dppm = bis(diphenylphosphino)methane)

1987 ◽  
Vol 26 (8) ◽  
pp. 1305-1309 ◽  
Author(s):  
F. Albert Cotton ◽  
Kim R. Dunbar
Keyword(s):  
Double Bond ◽  
Triple Bond ◽  
Oxidative Addition ◽  
Diphenyl Diselenide

Oxidative addition of diphenyl disulfide across a tantalum-tantalum double bond. Preparation and characterization of [TaCl3(Me2S)]2(.mu.-SPh)2

1986 ◽  
Vol 25 (3) ◽  
pp. 287-290 ◽  
Author(s):  
Gordon C. Campbell ◽  
Jo Ann M. Canich ◽  
F. Albert Cotton ◽  
Stan A. Duraj ◽  
James F. Haw
Keyword(s):  
Double Bond ◽  
Oxidative Addition ◽  
Diphenyl Disulfide

scholarly journals Channeling of Eukaryotic Diacylglycerol into the Biosynthesis of Plastidial Phosphatidylglycerol

2006 ◽  
Vol 282 (7) ◽  
pp. 4613-4625 ◽  
Author(s):  
Markus Fritz ◽  
Heiko Lokstein ◽  
Dieter Hackenberg ◽  
Ruth Welti ◽  
Mary Roth ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Double Bond ◽  
Transgenic Plants ◽  
Phosphatidic Acid ◽  
Lipid Analysis ◽  
Photosynthetic Apparatus ◽  
Hexadecenoic Acid ◽  
Transgenic Tobacco Plants ◽  
Tobacco Plants

Plastidial glycolipids contain diacylglycerol (DAG) moieties, which are either synthesized in the plastids (prokaryotic lipids) or originate in the extraplastidial compartment (eukaryotic lipids) necessitating their transfer into plastids. In contrast, the only phospholipid in plastids, phosphatidylglycerol (PG), contains exclusively prokaryotic DAG backbones. PG contributes in several ways to the functions of chloroplasts, but it is not known to what extent its prokaryotic nature is required to fulfill these tasks. As a first step toward answering this question, we produced transgenic tobacco plants that contain eukaryotic PG in thylakoids. This was achieved by targeting a bacterial DAG kinase into chloroplasts in which the heterologous enzyme was also incorporated into the envelope fraction. From lipid analysis we conclude that the DAG kinase phosphorylated eukaryotic DAG forming phosphatidic acid, which was converted into PG. This resulted in PG with 2–3 times more eukaryotic than prokaryotic DAG backbones. In the newly formed PG the unique Δ3-trans-double bond, normally confined to 3-trans-hexadecenoic acid, was also found in sn-2-bound cis-unsaturated C18 fatty acids. In addition, a lipidomics technique allowed the characterization of phosphatidic acid, which is assumed to be derived from eukaryotic DAG precursors in the chloroplasts of the transgenic plants. The differences in lipid composition had only minor effects on measured functions of the photosynthetic apparatus, whereas the most obvious phenotype was a significant reduction in growth.

Nature of the carbon-phosphorus double bond and the carbon-phosphorus triple bond as studied by solid-state NMR

1990 ◽  
Vol 112 (19) ◽  
pp. 6803-6809 ◽  
Author(s):  
James C. Duchamp ◽  
Marek Pakulski ◽  
Alan H. Cowley ◽  
Kurt W. Zilm
Keyword(s):  
Double Bond ◽  
Solid State ◽  
Solid State Nmr ◽  
Triple Bond
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