scholarly journals Selective access to p-dialkyl-carbo-benzenes from a [6]pericyclynedione: the n-butyl nucleophile model for a metal switch study

2017 ◽  
Vol 95 (4) ◽  
pp. 454-459 ◽  
Author(s):  
Chongwei Zhu ◽  
Carine Duhayon ◽  
Alix Saquet ◽  
Valérie Maraval ◽  
Remi Chauvin
Keyword(s):  
Crystal Structure ◽  
Electrochemical Behavior ◽  
Spectroscopic Properties ◽  
Grignard Reagents ◽  
Cyclic Voltammograms ◽  
Redox Processes ◽  
Metal Centers ◽  
X Ray ◽  
Selective Access ◽  
Switch Study

The synthesis, spectroscopic properties, comparative electrochemical behavior in CHCl3 vs CH2Cl2, and X-ray crystal structure of p-di-n-butyl-tetraphenyl-carbo-benzene are described. The selectivity of preparation of the ultimate [6]pericyclynediol precursor has been examined by comparing the reactivity of the [6]pericyclynedione substrate with four n-Bu-MXn nucleophiles involving more or less halogenated metal centers MXn (0 ≤ n ≤ 2): Li, MgBr, MgCl, CeCl2/LiCl. The cerium reagent is found to be the most efficient, giving approximately twice the yield given by Grignard reagents in the target diadduct (90% vs 51%–53%). The dibutyl-carbo-benzene product happens to be soluble in both CHCl3 and CH2Cl2: cyclic voltammograms of either solution exhibit almost identical peak potentials with reduced reversibility of the redox processes in CHCl3.

Systhesis, Characterization and Spectroscopic Properties of (2E,6E)-2,6-Bis(2,3,4-tri-methoxy-benzylidene)cyclohexanone

2011 ◽  
Vol 396-398 ◽  
pp. 2338-2341
Author(s):  
Xing Chuan Wei ◽  
Zhi Li Liu ◽  
Kun Zhang ◽  
Zhi Yun Du ◽  
Xi Zheng
Keyword(s):  
Crystal Structure ◽  
Acetic Acid ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Spectroscopic Properties ◽  
Spectral Studies ◽  
Double Bonds ◽  
X Ray ◽  
Π Interactions ◽  
X Ray Crystallography

In this paper, (2E,6E)-2,6-Bis(2,3,4-tri-methoxy -benzylidene)cyclohexanone (omitted as tmbcho) (1) was obtained by the reaction of acetic acid, tetrahydrofuran, cyclohexanone and 2,3,4-tri-methoxy-benzaldehyde. Three non-classic hydrogen bonds were observed in the compound. X-ray crystallography shows that the crystal structure is stabilized by intermolecular C-H•••π interactions and it contains plenty of conjugated double bonds. The title compound was characterized by UV-vis and fluorescent spectral studies.

Monoolefincobalt(0)-Komplexe / Monoolefincobalt(0) Complexes

1988 ◽  
Vol 43 (10) ◽  
pp. 1256-1262 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Goetz Lull ◽  
Birgit Rodenhäuser ◽  
Gerhard Cordier ◽  
Helmut Paulus
Keyword(s):  
Crystal Structure ◽  
Carbon Monoxide ◽  
Valence State ◽  
Cobalt Atom ◽  
Spectroscopic Properties ◽  
X Ray ◽  
Mononuclear Cobalt ◽  
Structure Determinations

Mononuclear cobalt(o) complexes containing olefin and trimethylphosphane ligands Co(olefin)(PMe3)3 (olefin = C2H4 (1), C3H6 (2), cyclopentene (3), trans-1,2-diphenylethene (4), tetrafluorobenzo-bicyclo-(2.2.2)-octadiene (5)), are obtained from CoCl2 by reaction with magnesium in the presence of the ligands or by substitution of 3 with olefin. X-ray crystal structure determinations of 4 and 5 show a distorted tetrahedral arrangement of ligands around the cobalt atom. Chemical and spectroscopic properties are consistent with a paramagnetic valence state of the compounds in solution. By reaction with carbon monoxide a dicobalt complex is formed, while azobenzene gives paramagnetic Co(N2Ph2)(PMe3)2.

Diolefincobalt(0)-Komplexe / Diolefincobalt(0) Complexes

1984 ◽  
Vol 39 (5) ◽  
pp. 643-648 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Joachim Groß ◽  
Hubert Witty ◽  
Dietmar Neugebauer
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Valence State ◽  
Cobalt Atom ◽  
Spectroscopic Properties ◽  
Dinuclear Complex ◽  
X Ray ◽  
Linear Dimer ◽  
Mononuclear Cobalt

Mononuclear cobalt(0) complexes containing diolefin and trimethylphosphane ligands Co(cycloocta-1,5-diene)(PMe3)2 and Co[(CH2=CHMe2Si)2O](PMe3)2 are obtained from CoCl2 by reaction with magnesium in the presence of the ligands or by substitution of cobalt(olefin)tris- (trimethylphosphane) with diolefin. Chemical and spectroscopic properties confirm the para- magnetic valence state of the compounds in solution. An X-Ray crystal structure determination of Co[(CH2=CHMe2Si)2O](PMe3)2 shows a tetrahedral arrangement of ligand functions around the cobalt atom. With butadiene a diamagnetic dinuclear complex [Co(C4H6)(PMe3)3]2 is obtained containing π-allyl co-ordination of two Co(PMe3)3 units to a linear dimer of butadiene

Darstellung und Struktur einiger η5 -Cyclopentadienyldicarbonyleisenbismut-Verbindungen Cp(CO)2 FeBiX2 mit fünffach koordiniertem Bismutatom/Synthesis and Structure of Some η5 -Cyclopentadienyldicarbonylironbismuth Compounds Cp(CO)2 FeBiX2 with Five-Coordinated Bismuth Atoms

1985 ◽  
Vol 40 (2) ◽  
pp. 258-262 ◽  
Author(s):  
Markus Wieber ◽  
Dieter Wirth ◽  
Christian Burschka
Keyword(s):  
Crystal Structure ◽  
Spectroscopic Properties ◽  
X Ray

Abstract The synthesis and the spectroscopic properties of the title compounds Cp(CO)2FeBiX2 (with X = SC(S)NEt 2 and SC(S)OMe) are described. The crystal structure of Cp(CO)2FeBi[SC(S)NEt2]2 was investigated by an X-ray analysis.

Synthesis, X-Ray Crystal Structure and Spectroscopic Properties of 1,2,3,4-Tetrahydro-2-(thenyl)-3-(N-thenylidine)-4-oxoquinazoline

2011 ◽  
Vol 41 (7) ◽  
pp. 986-990 ◽  
Author(s):  
Sumita Naskar ◽  
Subhendu Naskar ◽  
Alexander J. Blake ◽  
Haregewine Tadesse ◽  
Shyamal Kumar Chattopadhyay
Keyword(s):  
Crystal Structure ◽  
Spectroscopic Properties ◽  
X Ray
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