The Experts below are selected from a list of 122997 Experts worldwide ranked by ideXlab platform
Seijiro Matsubara - One of the best experts on this subject based on the ideXlab platform.
-
Cationic Iron(III) Porphyrin-Catalyzed [4 + 2] Cycloaddition of Unactivated Aldehydes with Simple Dienes
Journal of the American Chemical Society, 2012Co-Authors: Kyohei Fujiwara, Takuya Kurahashi, Seijiro MatsubaraAbstract:Cationic iron(III) porphyrin was found to be an efficient catalyst for the highly chemoselective hetero-Diels–Alder-type reaction of aldehydes with 1,3-Dienes. The catalyzed process did not require the use of electron-deficient aldehydes such as glyoxylic acid derivatives or activated electron-rich 1,3-Dienes such as Danishefsky’s diene and Rawal’s diene. The high functional group tolerance and robustness of the catalyst were demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition in the presence of water and by carrying out cycloaddition of an unactivated ketone such as cyclohexanone with a diene.
-
cationic iron iii porphyrin catalyzed 4 2 cycloaddition of unactivated aldehydes with simple Dienes
Journal of the American Chemical Society, 2012Co-Authors: Kyohei Fujiwara, Takuya Kurahashi, Seijiro MatsubaraAbstract:Cationic iron(III) porphyrin was found to be an efficient catalyst for the highly chemoselective hetero-Diels–Alder-type reaction of aldehydes with 1,3-Dienes. The catalyzed process did not require the use of electron-deficient aldehydes such as glyoxylic acid derivatives or activated electron-rich 1,3-Dienes such as Danishefsky’s diene and Rawal’s diene. The high functional group tolerance and robustness of the catalyst were demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition in the presence of water and by carrying out cycloaddition of an unactivated ketone such as cyclohexanone with a diene.
Kyohei Fujiwara - One of the best experts on this subject based on the ideXlab platform.
-
Cationic Iron(III) Porphyrin-Catalyzed [4 + 2] Cycloaddition of Unactivated Aldehydes with Simple Dienes
Journal of the American Chemical Society, 2012Co-Authors: Kyohei Fujiwara, Takuya Kurahashi, Seijiro MatsubaraAbstract:Cationic iron(III) porphyrin was found to be an efficient catalyst for the highly chemoselective hetero-Diels–Alder-type reaction of aldehydes with 1,3-Dienes. The catalyzed process did not require the use of electron-deficient aldehydes such as glyoxylic acid derivatives or activated electron-rich 1,3-Dienes such as Danishefsky’s diene and Rawal’s diene. The high functional group tolerance and robustness of the catalyst were demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition in the presence of water and by carrying out cycloaddition of an unactivated ketone such as cyclohexanone with a diene.
-
cationic iron iii porphyrin catalyzed 4 2 cycloaddition of unactivated aldehydes with simple Dienes
Journal of the American Chemical Society, 2012Co-Authors: Kyohei Fujiwara, Takuya Kurahashi, Seijiro MatsubaraAbstract:Cationic iron(III) porphyrin was found to be an efficient catalyst for the highly chemoselective hetero-Diels–Alder-type reaction of aldehydes with 1,3-Dienes. The catalyzed process did not require the use of electron-deficient aldehydes such as glyoxylic acid derivatives or activated electron-rich 1,3-Dienes such as Danishefsky’s diene and Rawal’s diene. The high functional group tolerance and robustness of the catalyst were demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition in the presence of water and by carrying out cycloaddition of an unactivated ketone such as cyclohexanone with a diene.
Takuya Kurahashi - One of the best experts on this subject based on the ideXlab platform.
-
Cationic Iron(III) Porphyrin-Catalyzed [4 + 2] Cycloaddition of Unactivated Aldehydes with Simple Dienes
Journal of the American Chemical Society, 2012Co-Authors: Kyohei Fujiwara, Takuya Kurahashi, Seijiro MatsubaraAbstract:Cationic iron(III) porphyrin was found to be an efficient catalyst for the highly chemoselective hetero-Diels–Alder-type reaction of aldehydes with 1,3-Dienes. The catalyzed process did not require the use of electron-deficient aldehydes such as glyoxylic acid derivatives or activated electron-rich 1,3-Dienes such as Danishefsky’s diene and Rawal’s diene. The high functional group tolerance and robustness of the catalyst were demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition in the presence of water and by carrying out cycloaddition of an unactivated ketone such as cyclohexanone with a diene.
-
cationic iron iii porphyrin catalyzed 4 2 cycloaddition of unactivated aldehydes with simple Dienes
Journal of the American Chemical Society, 2012Co-Authors: Kyohei Fujiwara, Takuya Kurahashi, Seijiro MatsubaraAbstract:Cationic iron(III) porphyrin was found to be an efficient catalyst for the highly chemoselective hetero-Diels–Alder-type reaction of aldehydes with 1,3-Dienes. The catalyzed process did not require the use of electron-deficient aldehydes such as glyoxylic acid derivatives or activated electron-rich 1,3-Dienes such as Danishefsky’s diene and Rawal’s diene. The high functional group tolerance and robustness of the catalyst were demonstrated. Further, the potential utility of the catalyst was demonstrated by performing the cycloaddition in the presence of water and by carrying out cycloaddition of an unactivated ketone such as cyclohexanone with a diene.
Tobias Ritter - One of the best experts on this subject based on the ideXlab platform.
-
1 2 selective hydrosilylation of conjugated Dienes
Journal of the American Chemical Society, 2014Co-Authors: Sarah E Parker, Jonas Borgel, Tobias RitterAbstract:Selective 1,2-hydrosilylation of 1,3-Dienes is a challenging problem in transition metal catalysis. Butadiene, specifically, would be a useful substrate because 3-butenylsilane products have promise as superior coupling reagents for hybrid organic/inorganic materials synthesis. We report the first selective 1,2-hydrosilylation of conjugated Dienes including butadiene. Hydrosilylation proceeds through a Pt(II/IV) cycle, and selectivity is generated at a hexacoordinate Pt(IV) complex that favors η2-diene coordination and prevents π-allyl complex formation.
-
iron catalyzed 1 4 addition of α olefins to Dienes
Organic Letters, 2009Co-Authors: Benoit Moreau, Tobias RitterAbstract:A new intermolecular, stereo- and regioselective iron-catalyzed 1,4-addition of α-olefins to 1,3-Dienes using as low as 1 mol % of an iminopyridine−ferrous chloride complex was developed. Importantly, both double bonds of the linear 1,4-diene addition products are obtained with absolute stereocontrol.
Henri Cramail - One of the best experts on this subject based on the ideXlab platform.
-
Bio-based aliphatic polyurethanes through ADMET polymerization in bulk and green solvent
Macromolecular Rapid Communications, 2014Co-Authors: Thomas Lebarb??, Arvind Sudhakar More, Prakash Sudhir Sane, Carine Alfos, Etienne Grau, Henri CramailAbstract:A new route to α,ω-diene urethane monomer is proposed by converting 10-undecenoic acid into the corresponding acyl azide, followed by urethanization with 10-undecenol. ADMET polymerizations of this α,ω-diene urethane monomer as well as other bio-based α,ω-Dienes bearing various organic functions (ester, carbonate, ether, amide) were carried out in bulk and solution conditions. A screening of the most commonly used metathesis catalysts allows to evaluate their tolerance toward the urethane function as well as toward Polarclean, a "green" and nontoxic high boiling point solvent. The influence of the nature of the central organic function in these α,ω-diene monomers on the thermomechanical properties is investigated.
-
Bio‐Based Aliphatic Polyurethanes Through ADMET Polymerization in Bulk and Green Solvent
Macromolecular Rapid Communications, 2013Co-Authors: Thomas Lebarbé, Arvind Sudhakar More, Prakash Sudhir Sane, Carine Alfos, Etienne Grau, Henri CramailAbstract:A new route to α,ω-diene urethane monomer is proposed by converting 10-undecenoic acid into the corresponding acyl azide, followed by urethanization with 10-undecenol. ADMET polymerizations of this α,ω-diene urethane monomer as well as other bio-based α,ω-Dienes bearing various organic functions (ester, carbonate, ether, amide) were carried out in bulk and solution conditions. A screening of the most commonly used metathesis catalysts allows to evaluate their tolerance toward the urethane function as well as toward Polarclean, a "green" and nontoxic high boiling point solvent. The influence of the nature of the central organic function in these α,ω-diene monomers on the thermomechanical properties is investigated.