نتایج جستجو برای: arylboronic acid

تعداد نتایج: 747762  

Journal: :Chemical communications 2012
Xiao Zhang Wen-Zhen Zhang Ling-Long Shi Chun-Xiao Guo Ling-Ling Zhang Xiao-Bing Lu

A variety of arylboronic esters were efficiently carboxylated with CO(2) using a simple AgOAc/PPh(3) catalyst, affording the corresponding carboxylic acids in good yield. This simple and efficient silver(i) catalytic system showed wide functional group compatibility.

Journal: :Chemical communications 2011
Xiao-Feng Wu Johannes Schranck Helfried Neumann Matthias Beller

A novel methodology for the direct nitration of arylboronic acids has been developed. By using inexpensive tert-butyl nitrite various aromatic nitro compounds are produced in moderate to good yields (45-87%) without the need of any catalyst.

Journal: :Journal of the American Chemical Society 2011
Chenghong Huang Theresa Liang Shinji Harada Eunsung Lee Tobias Ritter

A silver-mediated cross-coupling of trifluoromethoxide with aryl stannanes and arylboronic acids to give aryl trifluoromethyl ethers is reported. This is the first report of a transition-metal-mediated C(aryl)-OCF(3) bond formation.

Journal: :Chemical communications 2006
Sébastien L X Martina Richard B C Jagt Johannes G de Vries Ben L Feringa Adriaan J Minnaard

The catalytic asymmetric 1,2-addition of a series of arylboronic acids to 2,2,2-trifluoroacetophenones is described with high isolated yields (up to 96%) and good enantioselectivities (up to 83% ee) using a rhodium(I)/phosphoramidite catalyst.

Journal: :European Journal of Organic Chemistry 2022

Commercially available arylboronic acids can easily be converted into chiral boronic esters which subjected to Matteson homologations using Grignard reagents. The best results are obtained in one pot protocols without isolation of the ?-chloroboronic ester intermediates. Alkoxides also used as nucleophiles, but corresponding homologated found not stable.

Journal: :International Journal For Multidisciplinary Research 2023

A green and efficient protocol for ipso-hydroxylation of arylboronic acids has been developed using WEPBA (water extract papaya bark ash) as neat reaction media. The present media provides a clean strategy to get phenols in excellent yields.

2015
Ryo Tanaka Takaaki Hirose Yuushou Nakayama Takeshi Shiono

Boron-moiety-containing aluminoxanes (BMAOs) were prepared from the partial protonolysis of Me3Al using various arylboronic acids. Compared with methylaluminoxane (MAO) generated from the hydrolysis of Me3Al, BMAO prepared from C6F5B(OH)2 and Me3Al induced a higher activity at the same Al/Ti ratio in the Ti-based olefin polymerization catalyst (ansa-Me2Si(Flu)(NBu) TiMe2; 5). The time course of...

Journal: :Tetrahedron 2015
Jeffrey C Holder Emmett D Goodman Kotaro Kikushima Michele Gatti Alexander N Marziale Brian M Stoltz

The development and optimization of a palladium-catalyzed asymmetric conjugate addition of arylboronic acids to cyclic enone conjugate acceptors is described. These reactions employ air-stable and readily-available reagents in an operationally simple and robust transformation that yields β-quaternary ketones in high yields and enantioselectivities. Notably, the reaction itself is highly toleran...

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