X-ray studies of sterically congested diphenylethane derivatives. Substituent effect on carbon-carbon bond length

1991 ◽  
Vol 56 (2) ◽  
pp. 602-607 ◽  
Author(s):  
Przemyslaw Maslak ◽  
Javier N. Narvaez ◽  
Masood Parvez
Keyword(s):  
Bond Length ◽  
Substituent Effect ◽  
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.

Carbon–carbon bond formation through olefin–methylcarbyne linkage at a diruthenium centre: X-ray crystal structure of [Ru2(CO)(µ-CO){µ-η1,η3-C(Me)C(Me)CH2}(η-C5H5)2]

1981 ◽  
pp. 537-538 ◽  
Author(s):  
Andrew F. Dyke ◽  
Jacques E. Guerchais ◽  
Selby A. R. Knox ◽  
Jean Roué ◽  
Richard L. Short ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Bond Formation ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond

Carbon–carbon bond formation by alkyne–µ,η2-acetylide and alkyne–CO coupling in the reaction of (OC)5MCCPH (M = MN, Re) with HOs3(CO)10(µ,η2-CCPh). X-Ray structure of HOs3Re(CO)14(C2Ph)2

1984 ◽  
pp. 1158-1159 ◽  
Author(s):  
Avtandil A. Koridze ◽  
Ol'ga A. Kizas ◽  
Nadezhda E. Kolobova ◽  
Valentina N. Vinogradova ◽  
Nikolai A. Ustynyuk ◽  
...  
Keyword(s):  
Bond Formation ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond ◽  
Co Coupling

Stereoselective carbon–carbon bond formation via alkylation of [(η-5C5H5)Fe(PPh3)(CO)(COMeCHR)](R = Me,Prn,Ph): X-ray crystal structure of (Z)-[(η5-C5H5)Fe(PPh3)(CO)(COMeCHMe)]

1984 ◽  
Vol 0 (12) ◽  
pp. 745-747 ◽  
Author(s):  
Gordon J. Baird ◽  
Stephen G. Davies ◽  
Richard H. Jones ◽  
Keith Prout ◽  
Peter Warner
Keyword(s):  
Crystal Structure ◽  
Bond Formation ◽  
Carbon Bond ◽  
X Ray ◽  
Carbon Carbon Bond

Determination of carbon-carbon bond length from the absorption spectra of cyanine dyes

1991 ◽  
Vol 68 (6) ◽  
pp. 506 ◽  
Author(s):  
Richard S. Moog
Keyword(s):  
Bond Length ◽  
Absorption Spectra ◽  
Cyanine Dyes ◽  
Carbon Bond ◽  
Carbon Carbon Bond
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