Oxidative addition of 1,3-diynes at triosmium clusters with cleavage of the central carbon–carbon bond: X-ray crystal structure of [Os3(µ3,η2-C2Ph)(µ-C2Ph)(CO)9] derived from 1,4-diphenylbuta-1,3-diyne

1987 ◽  
pp. 461-463 ◽  
Author(s):  
Antony J. Deeming ◽  
Mark S. B. Felix ◽  
Paul A. Bates ◽  
Michael B. Hursthouse
Keyword(s):  
Crystal Structure ◽  
Oxidative Addition ◽  
Triosmium Clusters ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond ◽  
Central Carbon

The Conformation of Some 1,1,2,2-Tetraacylethanes in the Solid-State: Crystal-Structures of 1,1,2,2-Tetrabenzoylethane, 1,2-Diacetyl-1,2-Dibenzoylethane and 1,1,2,2-Tetraethoxycarbonylethane

1986 ◽  
Vol 39 (11) ◽  
pp. 1811 ◽  
Author(s):  
JR Cannon ◽  
VA Patrick ◽  
AH White
Keyword(s):  
Solid State ◽  
Least Squares ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
Keto Form ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond ◽  
Central Carbon ◽  
Least Squares Techniques

The crystal structures of 1,1,2,2-tetrabenzoylethane (3), 1,2-diacetyl- 1,2-dibenzoylethane (4) and 1,1,2,2-tetraethoxycarbonylethane (tetraethyl ethanetetracarboxylate ) (5) have been determined by X-ray diffraction from diffractometer data at 295 K and were refined by least-squares techniques to residuals of 0.050 (1077 'observed' reflections), 0.056 (3020) and 0.041 (480), respectively. Crystals of (3) are triclinic, Pī , Z 1, a 6.145(2), b 9.002(3), c 11.261(3) Ǻ; α 101.91(3), β 91.88(3), γ 105.94(3)°. Crystals of (4) are also triclinic, Pī , Z 2, a 17.119(5), b 7.210(1), c 7.175(2) Ǻ, α 89.59(2), β 72.92(2), γ 87.87(2)°. Crystals of (5) are tetragonal, P42/n, Z 4, a 17.748(6), c 5.515(1)Ǻ. In the solid state each compound exists in the keto form which adopts the antiperiplanar conformation about the central carbon-carbon bond.

An unexpected carbon-carbon bond formation in the reaction between [Co(.eta.5-C5H5)(CO)2] and hexafluorobut-2-yne. X-ray crystal structure of [{(.eta.5-C5H5)Co}2{.mu.-.eta.4,.eta.4-C4(CF3)4C10H12C4(CF3)4}].cntdot.0.5CH2Cl2

1987 ◽  
Vol 6 (9) ◽  
pp. 1930-1935 ◽  
Author(s):  
Miriam B. Gomes de Lima ◽  
Jacques E. Guerchais ◽  
Francoise J. Le Floch-Perennou ◽  
Paul. L'Haridon ◽  
Francois Y. Petillon ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Bond Formation ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond

scholarly journals Control of zeolite microenvironment for propene synthesis from methanol

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Longfei Lin ◽  
Mengtian Fan ◽  
Alena M. Sheveleva ◽  
Xue Han ◽  
Zhimou Tang ◽  
...  
Keyword(s):  
Active Sites ◽  
Inelastic Neutron Scattering ◽  
Sustainable Manufacturing ◽  
Methanol Conversion ◽  
Acid Sites ◽  
Light Olefins ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond ◽  
Catalytic Stability

AbstractOptimising the balance between propene selectivity, propene/ethene ratio and catalytic stability and unravelling the explicit mechanism on formation of the first carbon–carbon bond are challenging goals of great importance in state-of-the-art methanol-to-olefin (MTO) research. We report a strategy to finely control the nature of active sites within the pores of commercial MFI-zeolites by incorporating tantalum(V) and aluminium(III) centres into the framework. The resultant TaAlS-1 zeolite exhibits simultaneously remarkable propene selectivity (51%), propene/ethene ratio (8.3) and catalytic stability (>50 h) at full methanol conversion. In situ synchrotron X-ray powder diffraction, X-ray absorption spectroscopy and inelastic neutron scattering coupled with DFT calculations reveal that the first carbon–carbon bond is formed between an activated methanol molecule and a trimethyloxonium intermediate. The unprecedented cooperativity between tantalum(V) and Brønsted acid sites creates an optimal microenvironment for efficient conversion of methanol and thus greatly promotes the application of zeolites in the sustainable manufacturing of light olefins.

ChemInform Abstract: Stable Gold(III) Catalysts by Oxidative Addition of a Carbon-Carbon Bond.

ChemInform ◽  
2015 ◽  
Vol 46 (24) ◽  
pp. no-no
Author(s):  
Chung-Yeh Wu ◽  
Takahiro Horibe ◽  
Christian Borch Jacobsen ◽  
F. Dean Toste
Keyword(s):  
Oxidative Addition ◽  
Carbon Bond ◽  
Carbon Carbon Bond
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