Silica-Supported Tin Oxides as Heterogeneous Acid Catalysts for Transesterification of Soybean Oil with Methanol

2011 ◽  
Vol 51 (1) ◽  
pp. 225-231 ◽  
Author(s):  
Wenlei Xie ◽  
Hongyan Wang ◽  
Hui Li
Keyword(s):  
Soybean Oil ◽  
Acid Catalysts ◽  
Tin Oxides

Transesterification of Soybean Oil to Biodiesel by Brønsted-Type Ionic Liquid Acid Catalysts

2013 ◽  
Vol 36 (9) ◽  
pp. 1559-1567 ◽  
Author(s):  
H. Yanfei ◽  
H. Xiaoxiang ◽  
C. Qing ◽  
Z. Lingxiao
Keyword(s):  
Ionic Liquid ◽  
Soybean Oil ◽  
Acid Catalysts ◽  
Liquid Acid ◽  
Liquid Acid Catalysts

Efficient solid acid catalysts based on sulfated tin oxides for liquid phase esterification of levulinic acid with ethanol

2018 ◽  
Vol 560 ◽  
pp. 119-131 ◽  
Author(s):  
Margarita Popova ◽  
Pavletta Shestakova ◽  
Hristina Lazarova ◽  
Momtchil Dimitrov ◽  
Daniela Kovacheva ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Levulinic Acid ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Tin Oxides

Fattening Results of Finishing Pigs Fed Second-Stage Diets with a High Content of Oat Bran and Soybean Oil

2010 ◽  
Vol 25 (4) ◽  
pp. 341-351
Author(s):  
Aniela Falkowska ◽  
Dorota Bugnacka ◽  
Wojciech Kozera ◽  
Janusz Falkowski
Keyword(s):  
Soybean Oil ◽  
Finishing Pigs ◽  
Second Stage ◽  
Oat Bran

Lysine and Methionine Supplementation of Corn-Soybean Oil Meal Rations for Pigs in Drylot

1959 ◽  
Vol 18 (3) ◽  
pp. 1053-1058 ◽  
Author(s):  
D. C. Acker ◽  
D. V. Catron ◽  
V. W. Hays
Keyword(s):  
Soybean Oil ◽  
Methionine Supplementation

Urea-Catalyzed Functionalization of Unactivated C–H Bonds

2020 ◽  
Author(s):  
Alex L. Bagdasarian ◽  
Stasik Popov ◽  
Benjamin Wigman ◽  
Wenjing Wei ◽  
woojin lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Organic Synthesis ◽  
High Energy ◽  
Acid Catalysts ◽  
Potential Utility ◽  
New Paradigm ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Highly Active ◽  
Acidic Nature

Herein we report the 3,5bistrifluoromethylphenyl urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalyst mediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen bonding motifs and strong bases affords highly active Lewis acid catalysts capable of ionizing strong C–O bonds. Despite the highly Lewis acidic nature of these catalysts that enables triflate abstraction from sp<sup>2</sup> carbons, these newly found reaction conditions allow for the formation of heterocycles and tolerate highly Lewis basic heteroaromatic substrates. This strategy showcases the potential utility of dicoordinated vinyl carbocations in organic synthesis.<br>

Urea-Catalyzed Functionalization of Unactivated C–H Bonds

2020 ◽  
Author(s):  
Alex L. Bagdasarian ◽  
Stasik Popov ◽  
Benjamin Wigman ◽  
Wenjing Wei ◽  
woojin lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Organic Synthesis ◽  
High Energy ◽  
Acid Catalysts ◽  
Potential Utility ◽  
New Paradigm ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Highly Active ◽  
Acidic Nature

Herein we report the 3,5bistrifluoromethylphenyl urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalyst mediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen bonding motifs and strong bases affords highly active Lewis acid catalysts capable of ionizing strong C–O bonds. Despite the highly Lewis acidic nature of these catalysts that enables triflate abstraction from sp<sup>2</sup> carbons, these newly found reaction conditions allow for the formation of heterocycles and tolerate highly Lewis basic heteroaromatic substrates. This strategy showcases the potential utility of dicoordinated vinyl carbocations in organic synthesis.<br>

Arylboronic Acid-Catalyzed C-Allylation of Unprotected Oximes

2019 ◽  
Author(s):  
Juha Siitonen ◽  
Padmanabha V. Kattamuri ◽  
Muhammed Yousufuddin ◽  
Laszlo Kurti
Keyword(s):  
Total Synthesis ◽  
Acid Catalysts ◽  
Mechanistic Studies ◽  
Arylboronic Acid ◽  
Synthetic Utility ◽  
Acid Catalyzed

Unprotected keto- and aldoximes are readily <i>C</i>-allylated with allyl diisopropyl boronate in the presence of arylboronic acid catalysts to yield highly-substituted <i>N</i>-alpha-secondary (2°) and tertiary (3°) hydroxylamines. The method’s synthetic utility is demonstrated with the total synthesis of the trace alkaloid <i>N</i>-methyl-euphococcine. Preliminary experimental and computational mechanistic studies point toward the formation of a boroxine as the active allylating species.<br>

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