نتایج جستجو برای: nucleophilic substitution

تعداد نتایج: 59949  

Hassan Azizi Reza Ranjbar-Karimi,

Some aryl and heteroaryl azido compounds were synthesized from the reaction of corresponding fluoro and chloro compounds with sodium azide in DMF as solvent and under various reaction conditions especially ultrasonic irradiation. Reaction of aromatic and heteroaromatic azido compound with thioacetic acid in the presence of sodium hydrogen carbonate and in methanol as solvent led to the differen...

Mir Abdullah S. Sadiadi Saved Mojtaba Moosavi Shokofe Aghabevzi

The transesterification process of trimethylphosphate with ethanol and isopropanol is examined. It is found that the reaction does not proceed in the absence of base even at temperature up to 100°C, whereas in the presence of sodium alkoxide as a catalyst it takes place at room temperature leading to a mixture of mono-,bi-, tri-substitute esters as well as the minor by-products resulting from t...

Journal: :Journal of the American Chemical Society 2009
Daniel H Ess Robert J Nielsen William A Goddard Roy A Periana

Absolutely localized molecular orbital energy decomposition analysis of C-H activation transition states (TSs), including Pt, Au, Ir, Ru, W, Sc, and Re metal centers, shows an electrophilic, ambiphilic, and nucleophilic charge transfer (CT) continuum irrespective of the bonding paradigm (oxidative addition, sigma-bond metathesis, oxidative hydrogen migration, 1,2-substitution). Pt(II) insertion...

Journal: :Chemical communications 2007
Loïc Ropartz Nico J Meeuwenoord Gijsbert A van der Marel Piet W N M van Leeuwen Alexandra M Z Slawin Paul C J Kamer

Novel transition metal catalysts based on oligonucleotides can be easily obtained by functionalization of 5-iodouridine with phosphine ligands, resulting in good asymmetric induction in palladium catalyzed allylic nucleophilic substitution.

Journal: :Chemical communications 2011
Guillaume Vives Carlo Giansante Robin Bofinger Guillaume Raffy André Del Guerzo Brice Kauffmann Pinar Batat Gediminas Jonusauskas Nathan D McClenaghan

Selective nucleophilic substitution on a perfluorophenyl unit comprising a BODIPY fluorophore using an alkanethiol or a primary amine offers a quantitative fluorophore labelling strategy, while retaining high photostability and emission quantum yields approaching unity.

Journal: :Chemical communications 2011
Jonas F Buergler Antonio Togni

Intramolecular nucleophilic substitution of a trifluoromethyl group to form a 1,2-diphosphole derivative followed by the sequential addition of an alkylating agent and a carbanion are the key steps in the stereoselective synthesis of novel ferrocenyl diphosphines for asymmetric catalysis.

Journal: :Organic & biomolecular chemistry 2013
Jun-ya Kato Hiroshi Aoyama Tsutomu Yokomatsu

A novel method for the synthesis of pyrazolo[1,5-a]quinolines under the transition-metal-free conditions has been developed. This method involves a novel combination of aromatic nucleophilic substitution and Knoevenagel condensation reactions to give pyrazolo[1,5-a]quinolines.

Journal: :Organic letters 2010
Olaf Zeika Yongjun Li Steffen Jockusch Gerard Parkin Aaron Sattler Wesley Sattler Nicholas J Turro

The scope and limitations of the synthesis of polynitroxides by nucleophilic substitution of electron-deficient fluorinated aromatic compounds are described. The method provides a facile route to the formation of polynitroxides exhibiting strong electron exchange between nitroxide groups.

Journal: :Chemical communications 2011
Yan-Ping Zhu Qing-He Gao Mi Lian Jing-Jing Yuan Mei-Cai Liu Qin Zhao Yan Yang An-Xin Wu

The sustainable byproduct catalyzed domino strategy has been performed for the facile synthesis of α-formyloxy and acetoxy ketones via iodination/nucleophilic substitution/hydrolyzation/oxidation sequences from simple and readily available aromatic ketones/unsaturated methyl ketones.

Journal: :Beilstein Journal of Organic Chemistry 2005
Eugene V Babaev Natalya I Vasilevich Anna S Ivushkina

2-Aryl-6-cyano-7-methyl-5-indolizinones were successfully converted into 2-aryl-5-chloro-6-cyano-7-methylindolizines. The obtained 5-chloroindolizines readily underwent nucleophilic substitution at position 5 leading in high yields to novel 5-functionalised indolizines.

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