The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Kim Daasbjerg - One of the best experts on this subject based on the ideXlab platform.
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incorporation of cuo nps into modified uio 66 nh2 metal organic frameworks mofs with melamine for catalytic c o coupling in the Ullmann Condensation
New Journal of Chemistry, 2017Co-Authors: Samira Sadeghi, Mohammad Jafarzadeh, Amir Reza Abbasi, Kim DaasbjergAbstract:Herein, the UiO-66-NH2 metal–organic framework (MOF) is initially modified with melamine via a post-synthetic approach. CuO nanoparticles (NPs) are then anchored via the available functional groups (amine groups and π–electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs are characterized using different techniques including XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF is successfully used as a heterogeneous catalyst for C–O coupling in Ullmann Condensation. A catalytic amount of the supported catalyst (5% CuO) promotes the Condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 °C with KOH serving as a base) in good yield (30–95%) within 18–24 h. Even in the absence of KOH, the reaction is enabled with 55% yield in 24 h by grafting melamine with amine groups to create base active sites on the MOF, which indicates the additional role of the support as a base active site. The supported catalyst is easily recycled and reused several times with negligible loss in its activity. Furthermore, the copper leaching from the catalyst is as low as 1.2 wt% after being reused four times.
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Incorporation of CuO NPs into modified UiO-66-NH2 metal–organic frameworks (MOFs) with melamine for catalytic C–O coupling in the Ullmann Condensation
New Journal of Chemistry, 2017Co-Authors: Samira Sadeghi, Mohammad Jafarzadeh, Amir Reza Abbasi, Kim DaasbjergAbstract:Herein, the UiO-66-NH2 metal–organic framework (MOF) is initially modified with melamine via a post-synthetic approach. CuO nanoparticles (NPs) are then anchored via the available functional groups (amine groups and π–electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs are characterized using different techniques including XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF is successfully used as a heterogeneous catalyst for C–O coupling in Ullmann Condensation. A catalytic amount of the supported catalyst (5% CuO) promotes the Condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 °C with KOH serving as a base) in good yield (30–95%) within 18–24 h. Even in the absence of KOH, the reaction is enabled with 55% yield in 24 h by grafting melamine with amine groups to create base active sites on the MOF, which indicates the additional role of the support as a base active site. The supported catalyst is easily recycled and reused several times with negligible loss in its activity. Furthermore, the copper leaching from the catalyst is as low as 1.2 wt% after being reused four times.
Rolando F. Pellón - One of the best experts on this subject based on the ideXlab platform.
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mild method for Ullmann reaction of 2 chlorobenzoic acids and aminothiazoles or aminobenzothiazoles under ultrasonic irradiation
Synthetic Communications, 2007Co-Authors: Rolando F. Pellón, Maite L. Docampo, Mirta L FascioAbstract:Abstract One‐pot syntheses of 5H‐[1,3]thiazolo[2,3‐b]quinazolin‐5‐one, 12H‐[1,3]benzothiazolo[2,3‐b]quinazolin‐12‐one, and corresponding derivatives were developed using the copper‐catalyzed Ullmann Condensation. The use of ultrasonic irradiation enhanced yields and reduced the reaction time to minutes.
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Microwave-promoted Ullmann Condensation of 2-aminopyridines with 2-chlorobenzoic acids
Synthetic Communications, 2006Co-Authors: Rolando F. Pellón, Ana Martin, Maite L. Docampo, Miriam MesaAbstract:Abstract A new efficient synthetic method of microwave‐promoted Ullmann Condensation of 2‐aminopyridines with 2‐chlorobenzoic acids to yield various substituted 11H‐pyrido[2,1‐b]quinazolin‐11‐ones in dry media is presented. Results were compared with those obtained following the classical heating.
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fast synthesis of substituted n phenylanthranilic acids using Ullmann Condensation under microwave irradiation in dry media
Synthetic Communications, 2006Co-Authors: Ana Martin, Maite L. Docampo, Miriam Mesa, Victoria Gomez, Rolando F. PellónAbstract:Substituted N-phenylanthranilic acids using the Ullmann Condensation under microwave irradiation in dry media were obtained in good yield and short reaction times.
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synthesis of 9 methyl 11h pyrido 2 1 b quinazolin 11 one using the Ullmann Condensation
Synthetic Communications, 2006Co-Authors: Rolando F. Pellón, Maite L. Docampo, Victoria Gomez, Zulfia Kunakbaeva, Herman VelezcastroAbstract:Abstract The Ullmann Condensation between 2‐chlorobenzoic acid and 2‐amino‐6‐methyl pyridine in DMF as solvent yielded 2‐[(6‐methyl‐2‐pyridinyl)amino] benzoic acid. The cyclization of this acid gave two isomers, the 9‐methyl‐11H‐pyrido[2,1‐b]quinazolin‐11‐one and, in a minor quantity, 2‐methylbenzo[b][1,8]naphtyridin‐5(10H)‐one. Using ultrasound irradiation the pyridoquinazolin‐11‐one was obtained as the sole product.
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Microwave-assisted synthesis of 2-phenoxybenzoic acids
Journal of Chemical Research, 2006Co-Authors: Rolando F. Pellón, Ana Martin, Maite L. Docampo, Miriam Mesa, Victoria GomezAbstract:Substituted 2-phenoxybenzoic acid derivatives were synthesised in high yield and in short reaction times using the Ullmann Condensation of 2-chlorobenzoic acid with phenol derivatives under microwave irradiation in dry media.
Marko D. Saban - One of the best experts on this subject based on the ideXlab platform.
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copper i mediated ligand accelerated Ullmann type coupling of anilines with aryliodides ligand selection and reaction kinetics for synthesis of tri p tolylamine
Industrial & Engineering Chemistry Research, 2005Co-Authors: Touraj Manifar, Sohrab Rohani, Timothy P. Bender, Roger E. Gaynor, Bruce H Goodbrand, Marko D. SabanAbstract:Screening of eight ligands for the copper-catalyzed ligand-accelerated Ullmann Condensation of p-toluidine with 4-iodotoluene to produce tri-p-tolylamine (TTA) revealed that 2,2‘-dipyridyl and 4,4‘-dipyridyl gave the highest conversion to TTA in the shortest time. Based on the ligand-screening results, a mechanistic structure of the active reaction complex between copper and the two fastest ligands was proposed. The TTA synthesis reaction kinetics was followed by an HPLC method, and kinetic parameters of the reaction were determined in temperature range 128−196 °C. The Condensation of p-toludine with 4-iodotoluene to give TTA was modeled as a parallel-consecutive reaction system composed of two Condensation reactions. Reaction orders for the first Condensation reaction to give di-p-tolylamine were determined to be 1.18 and 1.16 with respect to 4-iodotoluene and p-toluidine, respectively. For the second Condensation reaction, the reaction orders were determined to be 0.13 and 0.11 with respect to 4-iodotol...
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Copper(I)-Mediated Ligand-Accelerated Ullmann-Type Coupling of Anilines with Aryliodides: Ligand Selection and Reaction Kinetics for Synthesis of Tri-p-Tolylamine
Industrial & Engineering Chemistry Research, 2005Co-Authors: Touraj Manifar, Sohrab Rohani, Timothy P. Bender, H. Bruce Goodbrand, Roger E. Gaynor, Marko D. SabanAbstract:Screening of eight ligands for the copper-catalyzed ligand-accelerated Ullmann Condensation of p-toluidine with 4-iodotoluene to produce tri-p-tolylamine (TTA) revealed that 2,2‘-dipyridyl and 4,4‘...
Samira Sadeghi - One of the best experts on this subject based on the ideXlab platform.
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incorporation of cuo nps into modified uio 66 nh2 metal organic frameworks mofs with melamine for catalytic c o coupling in the Ullmann Condensation
New Journal of Chemistry, 2017Co-Authors: Samira Sadeghi, Mohammad Jafarzadeh, Amir Reza Abbasi, Kim DaasbjergAbstract:Herein, the UiO-66-NH2 metal–organic framework (MOF) is initially modified with melamine via a post-synthetic approach. CuO nanoparticles (NPs) are then anchored via the available functional groups (amine groups and π–electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs are characterized using different techniques including XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF is successfully used as a heterogeneous catalyst for C–O coupling in Ullmann Condensation. A catalytic amount of the supported catalyst (5% CuO) promotes the Condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 °C with KOH serving as a base) in good yield (30–95%) within 18–24 h. Even in the absence of KOH, the reaction is enabled with 55% yield in 24 h by grafting melamine with amine groups to create base active sites on the MOF, which indicates the additional role of the support as a base active site. The supported catalyst is easily recycled and reused several times with negligible loss in its activity. Furthermore, the copper leaching from the catalyst is as low as 1.2 wt% after being reused four times.
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Incorporation of CuO NPs into modified UiO-66-NH2 metal–organic frameworks (MOFs) with melamine for catalytic C–O coupling in the Ullmann Condensation
New Journal of Chemistry, 2017Co-Authors: Samira Sadeghi, Mohammad Jafarzadeh, Amir Reza Abbasi, Kim DaasbjergAbstract:Herein, the UiO-66-NH2 metal–organic framework (MOF) is initially modified with melamine via a post-synthetic approach. CuO nanoparticles (NPs) are then anchored via the available functional groups (amine groups and π–electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs are characterized using different techniques including XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF is successfully used as a heterogeneous catalyst for C–O coupling in Ullmann Condensation. A catalytic amount of the supported catalyst (5% CuO) promotes the Condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 °C with KOH serving as a base) in good yield (30–95%) within 18–24 h. Even in the absence of KOH, the reaction is enabled with 55% yield in 24 h by grafting melamine with amine groups to create base active sites on the MOF, which indicates the additional role of the support as a base active site. The supported catalyst is easily recycled and reused several times with negligible loss in its activity. Furthermore, the copper leaching from the catalyst is as low as 1.2 wt% after being reused four times.
Daniel Yohannes - One of the best experts on this subject based on the ideXlab platform.
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total synthesis of deoxybouvardin and ra vii macrocyclization via an intramolecular Ullmann reaction
Journal of the American Chemical Society, 1991Co-Authors: Dale L. Boger, Daniel YohannesAbstract:We detail successful studies on the implementation of an intramolecular Ullmann Condensation reaction for direct closure to the 14-membered diaryl ethers that have proven inaccessible or less accessible by alternative routes and the use of this key macrocyclization reaction in the total synthesis of RA-VII and deoxybouvardin
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Intramolecular Ullmann Condensation reaction : an effective approach to macrocyclic Diaryl Ethers
The Journal of Organic Chemistry, 1991Co-Authors: Dale L. Boger, Daniel YohannesAbstract:The demonstration and definition of the scope of the intramolecular Ullmann Condensation reaction suitable for use in macrocyclization reactions leading to 14-membered para- and metacyclophanes possessing a diaryl ether are detailed
