Cobalt catalyzed carboxylation reaction of saturated hydrocarbons with CO in the presence of K2S2O8 and TFA under mild conditions

1999 ◽  
Vol 40 (50) ◽  
pp. 8867-8871 ◽  
Author(s):  
Mohammad Asadullah ◽  
Yuki Taniguchi ◽  
Tsugio Kitamura ◽  
Yuzo Fujiwara
Keyword(s):  
Saturated Hydrocarbons ◽  
Mild Conditions

ChemInform Abstract: Cobalt Catalyzed Carboxylation Reaction of Saturated Hydrocarbons with CO in the Presence of K2S2O8 and TFA under Mild Conditions.

ChemInform ◽  
2010 ◽  
Vol 31 (8) ◽  
pp. no-no
Author(s):  
Mohammad Asadullah ◽  
Yuki Taniguchi ◽  
Tsugio Kitamura ◽  
Yuzo Fujiwara
Keyword(s):  
Saturated Hydrocarbons ◽  
Mild Conditions

scholarly journals Vanadium Catalyzed Partial Oxidation of Some Saturated Hydrocarbons to Functionalized Products Under Mild Conditions

1970 ◽  
Vol 43 (3) ◽  
pp. 291-300 ◽  
Author(s):  
M Asadullah ◽  
M Shamim Uddin ◽  
M Israt Jahan ◽  
M Abdul Motin
Keyword(s):  
Optimum Condition ◽  
Key Words ◽  
Homogeneous Catalysis ◽  
Partial Oxidation ◽  
Carbonyl Compounds ◽  
Saturated Hydrocarbons ◽  
Vanadyl Acetylacetonate ◽  
Mild Conditions ◽  
Primary Products ◽  
Oxygenated Products

Partial oxidation of cyclopentane, cyclohexane, cycloheptane and propane to oxygenated products has been investigated using vanadyl acetylacetonate catalyst in presence of oxidant K2S2O8 in CF3COOH (TFA) solvent. It has been observed that the primary products were alcohols and carbonyl compounds. However, in the reaction of cycloheptane and propane, carbonyl was not formed. Alcohols subsequently reacted with TFAand produced esters. In case of propane, two esters were observed where iso-propyl trifluoroacetate was the dominant product and n-propyl trifluoroacetate was the minor product. In this case, about 89 mol% conversion was achieved. The conversion of cycloalkanes is found lower than that of propane. For the cyclohexane functionalization, the optimum condition found 7.5 mmol of K2S2O8, 5 mL of CF3COOH, 0.1 mmol of catalyst, 80°C reaction temperature and 1 mmol of cyclohexane.  Key words: Partial oxidation, Homogeneous catalysis, Hydrocarbon functionalization, Potassium persulfate and Trifluoroacetic acidDOI = 10.3329/bjsir.v43i3.1144Bangladesh J. Sci. Ind. Res. 43(3), 291-300, 2008

scholarly journals Facile Polyolefin Plastics Hydrogenolysis Catalyzed by a Surface Electrophilic d0 Hydride

2021 ◽  
Author(s):  
Alexander H. Mason ◽  
Alessandro Motta ◽  
Anusheela Das ◽  
Qing Ma ◽  
Michael J. Bedzyk ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Isotactic Polypropylene ◽  
Light Hydrocarbons ◽  
Major Fraction ◽  
Saturated Hydrocarbons ◽  
Acidic Support ◽  
Mild Conditions ◽  
Broad Array ◽  
Earth Abundant ◽  
Single Use

Polyolefins comprise a major fraction of single-use plastics and yet their catalytic deconstruction/recycling has proven challenging due to their inert hydrocarbon connectivities. Here an electrophilic earth-abundant single-site organozirconium catalyst chemisorbed on a highly Brønsted acidic support and characterized by a broad array of experimental and theoretical techniques, is shown to mediate the rapid hydrogenolytic cleavage of molecular and macromolecular saturated hydrocarbons under mild conditions. For n-hexadecane, hydrogenolysis to light hydrocarbons proceeds with an activity of 690 mol n-hexadecane · mol Zr-1 · h-1 at 150°C/2.5 atm H2 pressure. Under similar solventless conditions, polyethylene, polyethylene-co- 1-octene, isotactic polypropylene, and a post-consumer sandwich bag are rapidly hydrogenolyzed to low molecular mass hydrocarbons via a turnover-limiting C-C scission pathway involving ßalkyl transfer rather than more common σ-bond metathesis.

One-step carboxylation reaction of saturated hydrocarbons with CO by Co(OAc)2 catalyst under mild conditions

2000 ◽  
Vol 194-195 ◽  
pp. 443-452 ◽  
Author(s):  
M. Asadullah ◽  
Y. Taniguchi ◽  
T. Kitamura ◽  
Y. Fujiwara
Keyword(s):  
Saturated Hydrocarbons ◽  
Mild Conditions ◽  
One Step

The Diorgano Dichalcogenides Addition to Benzyne under Mild Conditions

2007 ◽  
Author(s):  
Fabiano Toledo ◽  
Henrique Marques ◽  
João Comasseto ◽  
Cristiano Raminelli
Keyword(s):  
Mild Conditions

Pt-Pd Nanoalloy for the Unprecedented Activation of Carbon-Fluorine Bond at Low Temperature

2019 ◽  
Author(s):  
Raghu Nath Dhital ◽  
keigo nomura ◽  
Yoshinori Sato ◽  
Setsiri Haesuwannakij ◽  
Masahiro Ehara ◽  
...  
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Dft Calculations ◽  
Bond Activation ◽  
Mild Conditions ◽  
Selective Transformation ◽  
Rate Determining Step ◽  
Highly Active ◽  
Harsh Conditions ◽  
Reaction Profile

Carbon-Fluorine (C-F) bonds are considered the most inert organic functionality and their selective transformation under mild conditions remains challenging. Herein, we report a highly active Pt-Pd nanoalloy as a robust catalyst for the transformation of C-F bonds into C-H bonds at low temperature, a reaction that often required harsh conditions. The alloying of Pt with Pd is crucial to activate C-F bond. The reaction profile kinetics revealed that the major source of hydrogen in the defluorinated product is the alcoholic proton of 2-propanol, and the rate-determining step is the reduction of the metal upon transfer of the <i>beta</i>-H from 2-propanol. DFT calculations elucidated that the key step is the selective oxidative addition of the O-H bond of 2-propanol to a Pd center prior to C-F bond activation at a Pt site, which crucially reduces the activation energy of the C-F bond. Therefore, both Pt and Pd work independently but synergistically to promote the overall reaction

Liquid Crystal Trimers Incorporating Saturated Isosteres of Benzene and Exhibiting Modulated Nematic Phases

2019 ◽  
Author(s):  
Adam Al-Janabi ◽  
Richard Mandle
Keyword(s):  
Liquid Crystal ◽  
Helical Structure ◽  
Molecular Shape ◽  
Saturated Hydrocarbons ◽  
Fluid System ◽  
Structural Requirement ◽  
Disubstituted Benzene ◽  
Bona Fide ◽  
Nematic Phases ◽  
Bend Angles

<p>The nematic twist-bend (N<sub>TB</sub>) liquid crystal phase possesses a local helical structure with a pitch length of a few nanometres and is the first example of spontaneous symmetry breaking in a fluid system. All known examples of the N­<sub>TB­</sub> phase occur in materials whose constituent mesogenic units are aromatic hydrocarbons. It is not clear if this is due to synthetic convenience or a <i>bona fide</i> structural requirement for a material to exhibit this phase of matter. In this work we demonstrate that materials consisting largely of saturated hydrocarbons could also give rise to this mesophase. Furthermore, replacement of 1,4-disubstituted benzene with <i>trans</i> 1,4-cyclohexane or even 1,4-cubane does not especially alter the transition temperatures of the resulting material nor does it appear to impact upon the heliconical tilt angle, suggesting the local structure of the phase is unperturbed. Calculating the probability distribution of bend angles reveals that the choice of isosteric group has little impact on the overall molecular shape, demonstrating the shape-driven nature of the N<sub>TB</sub> phase. </p>

Double Ring-Closing Approach for the Synthesis of 2,3,6,7-Substituted Anthracene Derivatives

2020 ◽  
Author(s):  
Birgit Meindl ◽  
Katharina Pfennigbauer ◽  
Berthold Stöger ◽  
Martin Heeney ◽  
Florian Glöcklhofer
Keyword(s):  
Wittig Reaction ◽  
Condensation Reaction ◽  
Synthetic Methods ◽  
Anthracene Derivative ◽  
Double Ring ◽  
Mild Conditions ◽  
Wide Range ◽  
Anthracene Derivatives

Anthracene derivatives have been used for a wide range of applications and many different synthetic methods for their preparation have been developed. However, despite continued synthetic efforts, introducing substituents in some positions has remained difficult. Here we present a method for the synthesis of 2,3,6,7-substituted anthracene derivatives, one of the most challenging anthracene substitution patterns to obtain. The method is exemplified by the preparation of 2,3,6,7-anthracenetetracarbonitrile and employs a newly developed, stable protected 1,2,4,5-benzenetetracarbaldehyde as the precursor. The precursor can be obtained in two scalable synthetic steps from 2,5-dibromoterephthalaldehyde and is converted into the anthracene derivative by a double intermolecular Wittig reaction under very mild conditions followed by a deprotection and intramolecular double ring-closing condensation reaction. Further modification of the precursor is expected to enable the introduction of additional substituents in other positions and may even enable the synthesis of fully substituted anthracene derivatives by the presented approach.<br>

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