scholarly journals Palladium(II) complexes with R2edda derived ligands, Part I: Reaction of diisopropyl (S,S)-2,2'-(1,2-ethanediyldiimino)- dipropanoate with K2[PdCl4]

2009 ◽  
Vol 74 (4) ◽  
pp. 389-400 ◽  
Author(s):  
Bojana Krajcinovic ◽  
Goran Kaludjerovic ◽  
Dirk Steinborn ◽  
Harry Schmidt ◽  
Christoph Wagner ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Diffraction Analysis ◽  
13C Nmr ◽  
Ester Group ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
1H And 13C Nmr ◽  
X Ray

The reaction of K2[PdCl4] with (S,S)-(i-Pr)2eddip diester (diisopropyl (S,S)-2,2'-(1,2-ethanediyldiimino)dipropanoate) resulted in {PdCl2[(S,S)-(i- -Pr)2eddip-?2N,N']} (1) and {PdCl[(S,S)-(i-Pr)eddip-?2N,N',?O]} (2) with one hydrolyzed ester group. The compounds were characterized by spectroscopic methods and it was proved that the reaction is diastereoselective (1H- and 13C-NMR) in the case of 2 (one diastereoisomer of four possible). The structure of 2 was determined by X-ray diffraction analysis, indicating that the product is the (R,R)-N,N' configured isomer. In contrast, the reaction yielding 1 produced two of three possible diastereoisomers. DFT calculations support the formation of two diastereoisomers of 1 and of one diastereoisomer of 2.

Synthesis, Characterization, and Catalytic Activity of a Series of Aluminium–Amidate Complexes

2015 ◽  
Vol 68 (3) ◽  
pp. 357 ◽  
Author(s):  
Kevin P. Yeagle ◽  
Darryl Hester ◽  
Nicholas A. Piro ◽  
William G. Dougherty ◽  
W. Scott Kassel ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
X Ray Diffraction ◽  
Metathesis Reaction ◽  
Chloride Complexes ◽  
1H And 13C Nmr ◽  
X Ray

The aluminium complexes {[κ2-N,O-(t-BuNCOPh)]AlMe2}2 (2), [κ2-N,O-(t-BuNCOPh)]2AlMe (3), and [κ2-N,O-(t-BuNCOPh)]3Al (4) were prepared through the protonolysis reaction between trimethylaluminium and one, two, or three equivalents, respectively, of N-tert-butylbenzamide. Complex 2 was also prepared via a salt metathesis reaction between K(t-BuNCOPh) and dimethylaluminium chloride. Complexes 2–4 were characterized using 1H and 13C NMR spectroscopy. Single-crystal X-ray diffraction analysis of the complexes corroborated ligand : metal stoichiometries and revealed that all the amidate ligands coordinate to the aluminium ion in a κ2 fashion. The Al–amidate complexes 2–4 were viable catalyst precursors for the Meerwein–Ponndorf–Verley–Oppenauer reduction–oxidation manifold, successfully interconverting several classes of carbonyl and alcohol substrates.

Bis(μ-carboxylato)dienerhodium(I) Complexes - Synthesis, Characterization and Catalytic Activity

2008 ◽  
Vol 73 (8-9) ◽  
pp. 1205-1221 ◽  
Author(s):  
Jiří Zedník ◽  
Jan Sedláček ◽  
Jan Svoboda ◽  
Jiří Vohlídal ◽  
Dmitrij Bondarev ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffraction Analysis ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray

Dinuclear rhodium(I) η2:η2-cycloocta-1,5-diene (series a) and η2:η2-norborna-2,5-diene (series b) complexes with μ-RCOO- ligands, where R is linear C21H43 (complexes 1a, 1b), CH2CMe3 (2a, 2b), 1-adamantyl (3a, 3b) and benzyl (4a, 4b), have been prepared and characterized by spectroscopic methods. Structures of complexes 2b, 3a and 4a were determined by X-ray diffraction analysis. Complexes prepared show low to moderate catalytic activity in polymerization of phenylacetylene in THF giving high-cis-transoid polymers, but they show only oligomerization activity in dichloromethane.

scholarly journals A Pair of New Polyketide Enantiomers from Three Endolichenic Fungal Strains Nigrospora sphaerica, Alternaria alternata, and Phialophora sp

2016 ◽  
Vol 11 (6) ◽  
pp. 1934578X1601100 ◽  
Author(s):  
Jun-Wei He ◽  
Chuan-Xi Wang ◽  
Li Yang ◽  
Guo-Dong Chen ◽  
Dan Hu ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Alternaria Alternata ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fungal Strains ◽  
The Absolute ◽  
Modified Mosher’S Method

A pair of new enantiomeric polyketides, (-)- and (+)-nigrosporaol A (1a and 1b), along with one related known compound, (±)-alternarienoic acid (2), were isolated from three endolichenic fungal strains, Nigrospora sphaerica (No.83-1-1-2), Alternaria alternata (No.58-8-4-1), and Phialophora sp.(No.96-1-8-1). Their structures, including the absolute configurations, were elucidated on the basis of spectroscopic methods, X-ray diffraction analysis, and the modified Mosher's method.

Molecular structure in the solid state (X-Ray diffraction) and in solution (1H and 13C NMR) of nifurtimox and two pyrazol-1-Yl analogs

2010 ◽  
Vol 97 (11-12) ◽  
pp. 1055-1066 ◽  
Author(s):  
Ma de la Concepción Foces-Foces ◽  
Félix Hernández Cano ◽  
Rosa Ma Claramunt ◽  
Alain Fruchier ◽  
José Elguero
Keyword(s):  
Molecular Structure ◽  
Solid State ◽  
13C Nmr ◽  
X Ray Diffraction ◽  
1H And 13C Nmr ◽  
X Ray

π-Olefin-Iridium-Komplexe, XIII [1] Neuartige metallzentrierte Verknüpfung zweier Tolan-Moleküle / π-Olefin Iridium Complexes, XIII [1] Novel Metal-Centered Linkage of Two Tolane Molecules

1986 ◽  
Vol 41 (1) ◽  
pp. 76-78 ◽  
Author(s):  
Jörn Müller ◽  
Matthias Tschampel ◽  
Joachim Pickardt
Keyword(s):  
Diffraction Analysis ◽  
Spectroscopic Methods ◽  
Iridium Complexes ◽  
X Ray Diffraction ◽  
Methyl Group ◽  
X Ray

Reaction of [(cod)IrI]2 (cod = 1,5-cyclooctadiene) with methyllithium in the presence of diphenylacetylene (tolane) yields a (cod)Ir complex (3) with a 1-benzyl-2.3-diphenyl-7-methyl-indenyl ligand which is formed by a novel cyclization of two tolane units with participation of a methyl group. The compound was characterized by spectroscopic methods and by X-ray diffraction analysis.

Scholl Reaction of an ortho-Phenylene-bridged Cyclic Pyrrole-Thiophene Hybrid Hexamer

Synthesis ◽  
2021 ◽  
Author(s):  
Yusuke Matsuo ◽  
Atsuhiro Osuka ◽  
Takayuki Tanaka
Keyword(s):  
Dft Calculations ◽  
Diffraction Analysis ◽  
Strain Energy ◽  
Fluorescence Spectra ◽  
Reaction Path ◽  
Absorption And Fluorescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rigid Structure ◽  
Type Compound

Scholl reaction of ortho-phenylene-bridged cyclic pyrrole-thiophene hybrid hexamer exclusively gave a cyclophane-type compound of [5]heterohelicenes in 45% yield. The structure was unambiguously revealed by X-ray diffraction analysis. This helicenophane-type compound showed sharp absorption and fluorescence spectra, reflecting its rigid structure. The reaction path was analyzed on the basis of DFT calculations. The reaction path was analyzed on the basis of DFT calculations, and it was found that the formation of 8 is thermodynamically favored and further oxidation is prohibited due to the increased strain energy.

Unusual 2:3:2 complex of DABCO mono-betaine with HCl and H2O studied by X-ray diffraction, DFT calculations and spectroscopic methods

2009 ◽  
Vol 938 (1-3) ◽  
pp. 283-290 ◽  
Author(s):  
P. Barczyński ◽  
Z. Dega-Szafran ◽  
A. Katrusiak ◽  
W. Perdoch ◽  
M. Szafran
Keyword(s):  
Dft Calculations ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray
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