Unexpected Anion Effect in the Alkoxylation of Alkynes Catalyzed by N-Heterocyclic Carbene (NHC) Cationic Gold Complexes

2014 ◽  
Vol 20 (45) ◽  
pp. 14594-14598 ◽  
Author(s):  
Luca Biasiolo ◽  
Marina Trinchillo ◽  
Paola Belanzoni ◽  
Leonardo Belpassi ◽  
Vincenzo Busico ◽  
...  
Keyword(s):  
Gold Complexes ◽  
Anion Effect ◽  
Cationic Gold

Ligand Exchange at a Gold(I) Carbene Complex

2013 ◽  
Vol 68 (5-6) ◽  
pp. 467-473 ◽  
Author(s):  
Mareike C. Jahnke ◽  
Tania Pape ◽  
F. Ekkehardt Hahn
Keyword(s):  
Ligand Exchange ◽  
Gold Complex ◽  
X Ray Diffraction ◽  
Substitution Reactions ◽  
Gold Complexes ◽  
X Ray ◽  
Linear Fashion ◽  
Product Mixture ◽  
Diffraction Structure ◽  
Cationic Gold

Gold complex [AuCl(NHC)] (NHC=N,N0-dipropylbenzimidazolin-2-ylidene) 1 undergoes facile substitution reactions at the gold(I) center. Treatment of 1 with anionic phenylacetylide or thiophenolate led to the neutral gold complexes 2 and 3, respectively. The cationic gold complexes [Au(NHC)(pyridine)](BF4) [4]BF4 and [Au2(NHC)2(4,4'-bipyridine)](BF4)2 [5](BF4)2 were obtained via abstraction of the chloro ligand from 1 and reaction with the appropriate amine. Reaction of 1 with AgBF4 in the presence of PPh3 instead of an amine led to an inseparable product mixture of the mixed NHC=PPh3 complex [6]BF4, the dicarbene complex [Au(NHC)2]BF4, [7]BF4, and [Au(PPh3)2]BF4, [8]BF4. Crystals of 2 and [6]BF4 were obtained, and X-ray diffraction structure analyses revealed that the gold(I) atoms are coordinated in a linear fashion by the NHC and the co-ligand

ChemInform Abstract: Anion-Induced Enantioselective Cyclization of Diynamides to Pyrrolidines Catalyzed by Cationic Gold Complexes.

ChemInform ◽  
2013 ◽  
Vol 44 (12) ◽  
pp. no-no
Author(s):  
Asmaa Kamal Mourad ◽  
Juliane Leutzow ◽  
Constantin Czekelius
Keyword(s):  
Gold Complexes ◽  
Cationic Gold

The synthesis of pyrroles and oxazoles based on gold α-imino carbene complexes

2016 ◽  
Vol 52 (46) ◽  
pp. 7336-7339 ◽  
Author(s):  
Nicole S. Y. Loy ◽  
Subin Choi ◽  
Sunggak Kim ◽  
Cheol-Min Park
Keyword(s):  
Gold Complexes ◽  
Enol Ethers ◽  
Carbene Complexes ◽  
Cationic Gold

Cationic gold complexes of α-oximimino carbenes have been identified to react with weak nucleophiles including enol ethers and nitriles.

Encapsulation Studies of Cationic Gold Complexes within a Self-Assembled Hexameric Resorcin[4]arene Capsule

2013 ◽  
Vol 2013 (8) ◽  
pp. 1494-1500 ◽  
Author(s):  
Louis Adriaenssens ◽  
Ana Escribano-Cuesta ◽  
Anna Homs ◽  
Antonio M. Echavarren ◽  
Pablo Ballester
Keyword(s):  
Gold Complexes ◽  
Self Assembled ◽  
Cationic Gold

Mechanism of the Dehydrogenative Silylation of Alcohols Catalyzed by Cationic Gold Complexes: An Experimental and Theoretical Study

2011 ◽  
Vol 17 (7) ◽  
pp. 2256-2265 ◽  
Author(s):  
Stéphanie Labouille ◽  
Aurélie Escalle-Lewis ◽  
Yves Jean ◽  
Nicolas Mézailles ◽  
Pascal Le Floch
Keyword(s):  
Theoretical Study ◽  
Gold Complexes ◽  
Cationic Gold

Anion-Induced Enantioselective Cyclization of Diynamides to Pyrrolidines Catalyzed by Cationic Gold Complexes

2012 ◽  
Vol 51 (44) ◽  
pp. 11149-11152 ◽  
Author(s):  
Asmaa Kamal Mourad ◽  
Juliane Leutzow ◽  
Constantin Czekelius
Keyword(s):  
Gold Complexes ◽  
Cationic Gold

Electronmicroscopic localization of ribonucleic acids in ciliate Bursaria truncatella during cell division

1990 ◽  
Vol 48 (3) ◽  
pp. 132-133
Author(s):  
Vladimir Popenko ◽  
Natalya Cherny ◽  
Maria Yakovleva
Keyword(s):  
Cell Division ◽  
High Specificity ◽  
Longitudinal Axis ◽  
Gold Complexes ◽  
Somatic Nucleus ◽  
Ribonucleic Acids ◽  
Biological Meaning ◽  
Bivalent Cations ◽  
Lowicryl K4m ◽  
Short Time

Highly polyploid somatic nucleus (macronucleus) of ciliate Bursaria truncatella under goes severe changes in morphology during cell division. At first, macronucleus (Ma) condences, diminishes in size and turns perpendicular to longitudinal axis of the cell. After short time, Ma turns again, elongates and only afterwards the process of division itself occurs. The biological meaning of these phenomena is not clear.Localization of RNA in the cells was performed on sections of ciliates B. truncatella, embedded in “Lowicryl K4M” at various stages: (1) before cell division (Figs. 2,3); (11) at the stage of macronucleus condensation; (111) during elongation of Ma (Fig.4); (1111) in young cells (0-5min. after division). For cytochemical labelling we used RNaseAcolloidal gold complexes (RNase-Au), which are known to bind to RNA containing cell ularstructures with high specificity. The influence of different parameters on the reliability and reproducibility of labelling was studied. In addition to the factors, discussed elsewhere, we found that the balance of mono- and bivalent cations is of great significance.

Preparation of Cationic Gold Nanoparticles for Gene Delivery

2008 ◽  
Vol 2 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Guoping Chen ◽  
Michiaki Takezawa ◽  
Naoki Kawazoe ◽  
Tetsuya Tateishi
Keyword(s):  
Gold Nanoparticles ◽  
Gene Delivery ◽  
Cationic Gold
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