نتایج جستجو برای: regioselective

تعداد نتایج: 2974  

Journal: :Chemical communications 2008
Mateo Alajarín Aurelia Pastor Raúl-Angel Orenes Andres E Goeta Jonathan W Steed

The self-assembly of chiral tris(m-ureidobenzyl)amines to give dimeric capsules is a highly diastereoselective process in solution, while in the solid state, the formation of the corresponding capsules is not only diastereoselective but also regioselective.

Journal: :Chemical communications 2014
Florian Pünner Gerhard Hilt

The CH-activation of THF is realized in a zinc-mediated process using a dibromocyclopropane as a crucial additive. The highly regioselective addition to aryl-substituted propiolates as well as the regio- and stereoselective addition to diynes are described.

Journal: :Chemical communications 2011
Chen Zheng Renhua Fan

A facile synthesis of potentially useful 1-diiodomethylene indanes and cyclopentanes from the regioselective cyclization of acetylenic malonates with the combination of iodosobenzene with tetrabutylammonium iodide in 2,2,2-trifluoroethanol is reported.

Journal: :Chemical communications 2008
Alejandro M Granados Alejandro M Fracaroli Rita H de Rossi Pedro Fuertes Tomás Torroba

A phenylethynyl Fischer carbene complex was used as a traceless directing group for the regioselective cycloaddition of dithiolethiones to arylacetylene, which constitutes the first synthesis of E-dithiafulvene thione or dithioesters.

Journal: :Chemical communications 2015
Hideki Abe Satoko Itaya Kei Sasaki Toyoharu Kobayashi Hisanaka Ito

Total synthesis of the proposed structure of a polyketide isolated from Phialomyces macrosporus is described. The synthesis involved chemoselective epoxidation, regioselective epoxide ring opening, chemo- and diastereoselective dihydroxylation, and vinylation of lactone accompanied by the formation of a furan ring.

Journal: :Chemical communications 2010
David R Williams Akshay A Shah

The regioselective Stille cross-coupling reactions of 3-tri-n-butylstannyl-1-trimethylsilyl-1-propyne demonstrate isomerization following the initial transmetalation step resulting in allenyl palladium intermediates for reductive coupling to yield conjugated 1,1-disubstituted allenylsilanes.

Journal: :Chemical communications 2016
Nicola Armenise Nabil Tahiri Niek N H M Eisink Mathieu Denis Manuel Jäger Johannes G De Vries Martin D Witte Adriaan J Minnaard

The catalyst palladium/2,9-CD3-phenanthroline has a 1.8 times higher turnover number than its non-deuterated counterpart in the aerobic alcohol oxidation of methyl glucoside and allows the regioselective oxidation with dioxygen as the terminal oxidant.

Journal: :Chemical communications 2013
Ayaka Yamaji Satoru Hiroto Ji-Young Shin Hiroshi Shinokubo

Treatment of meso-mesityl 5,15-diazaporphyrin with alkyllithiums in toluene at low temperature provided monoalkylated diazachlorins through highly regioselective nucleophilic addition at the β-position near the meso-nitrogen atom.

Journal: :Chemical communications 2015
K W J Heard J J Morrison L Weston C H Lo L Pirvu J Raftery M S Little J J W McDouall S G Yeates P Quayle

The regioselective, orthogonal functionalisation of 4,10-dichlorochrysene enables the synthesis of a variety of 2,8,4,10-"A2B2"-tetrasubstituted chrysenes. Such compounds exhibit broadened UV-vis absorption spectra, decreased band gap and higher HOMO levels compared to the parent chrysene.

Journal: :Chemical communications 2015
Vikas Dwivedi Madala Hari Babu Ruchir Kant Maddi Sridhar Reddy

A highly general palladium catalysed regioselective hydroalkynylation of ynamides for versatile enamide building blocks with an alkyne tether is achieved with an N-substitution dependent stereoselectivity switch under very mild reaction conditions.

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