Results 81 to 90 of about 42,802 (288)

Relevance of cis- and trans-dichloride Ru intermediates in Grubbs-II olefin metathesis catalysis (H(2)IMesCl(2)Ru=CHR) [PDF]

, 2008
Using density functional theory with the B3LYP and M06 functionals, we show conclusively that the (H2IMes)(Cl)2Ru olefin metathesis mechanism is bottom-bound with the chlorides remaining trans throughout the reaction, thus attempts to effect diastereo ...
Benitez, Diego, Goddard, William A., III, Tkatchouk, Ekaterina   +2 more
core   +2 more sources

Focus on chirality of HIV-​1 non-​nucleoside reverse transcriptase inhibitors [PDF]

, 2016
Chiral HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs) are of great interest since one enantiomer is often more potent than the corresponding counterpart against the HIV-1 wild type (WT) and the HIV-1 drug resistant mutant strains.
Famiglini, Valeria, Silvestri, Romano
core   +2 more sources

Mirror symmetry breaking with limited enantioselective autocatalysis and temperature gradients: a stability survey

, 2012
We analyze limited enantioselective (LES) autocatalysis in a temperature gradient and with internal flow/recycling of hot and cold material. Microreversibility forbids broken mirror symmetry for LES in the presence of a temperature gradient alone.
Blanco, Celia, Crusats, Joaquim, El-Hachemi, Zoubir, Hochberg, David, Moyano, Albert, Ribó, Josep M.   +5 more
core   +1 more source

Counterion effects in iminium-activated electrophilic aromatic substitutions of pyrroles. [PDF]

, 2011
Electrophilic substitution of pyrroles by a,b-unsaturated iminium ions is slow in acetonitrile when only weakly basic counterions are present. When the reactions are carried out in the presence of KCF3CO2, fast deprotonation of the intermediate r-adducts
Albert, Almaşi, Benfatti, Brazier, Brazier, Brown, Capdevila, Cozzi, Erkkilä, Fleischer, Gordillo, Groselj, Groselj, Herbert Mayr, Lakhdar, Lakhdar, Lakhdar, Lelais, List, Mayr, Mayr, Mayr, Mayr, Mayr, Nigst, Paras, Sami Lakhdar, Seayad, Seebach, Seebach, Sparr, Sparr, Terrasson, Tsogoeva   +33 more
core   +1 more source

Iodoarene-Catalyzed Cyclizations of Unsaturated Amides [PDF]

, 2015
The cyclization of N-alkenylamides catalyzed by iodoarenes under oxidative conditions is presented. Five-, six-, and seven-membered rings with a range of substitutions can be prepared by this route.
Ali Alhalib, Bode H. B., Degnan B. M., Dohi T., Dohi T., Fujita M., Fujita M., Guilbault A.-A., Guilbault A.-A., Hamnett D. J., Kong A., Mizar P., Moon N. G., Murai T., Ngatimin M., Parra A., Richardson R. D., Rodríguez A., Rodríguez A., Shimogaki M., Somaia Kamouka, Suzuki S., Uyanik M., Uyanik M., Wesley J. Moran, Wu H., Yan J., Zhdankin V. V., Zheng Z. S., Zhong W., Zhou Z.-S.   +30 more
core   +1 more source

Research Progress on the Selectivity and Biomagnification of Chiral Hexabromocyclododecanes Pollutants in Food Chain Transfer

Yankuang ceshi, 2016
Hexabromocyclododecanes (HBCDs) are globally produced brominated flame retardant (BFR) and are used primarily as an additive FR in thermal insulation building materials, upholstery textiles, and electronics.
TIAN Qin, TONG Ling, SONG Shu-ling, ZHAN Nan, PAN Meng, QIU Jing   +5 more
doaj   +1 more source

Synthesis and use of a stable aminal derived from TsDPEN in asymmetric organocatalysis [PDF]

, 2010
A stable aminal formed stereoselectively from (R,R)-N-tosyl-1,2-diphenyl-1,2-ethylenediamine (TsDPEN) is capable of asymmetric organocatalysis of Diels-Alder and alpha-amination reactions of ...
Clarkson, Guy J., Gosiewska, Silvia, Soni, Rina, Wills, Martin   +3 more
core   +1 more source

Enantioselective Aminosilylation of Alkenes by Palladium/Ming‐Phos‐Catalyzed Tandem Narasaka–Heck/Silylation Reaction

Advanced Science
A Pd‐catalyzed enantioselective aminosilylation of alkenes via tandem Aza‐Heck/silylation reaction under Pd/Sadphos catalysis is disclosed. A wide array of oxime esters and silicon reagents are tolerated, furnishing the chiral pyrrolines bearing one ...
Kangning Cao, Jie Han, Wenshao Ye, Dejun Hu, Zihao Ye, Junfeng Yang, Junliang Zhang, Fener Chen   +7 more
doaj   +1 more source

Photografted methacrylate-based monolithic columns coated with cellulose tris(3,5-dimethylphenylcarbamate) for chiral separation in CEC [PDF]

, 2018
A chiral capillary monolithic column for enantiomer separation in capillary electrochromatography was prepared by coating cellulose tris(3,5-dimethylphenylcarbamate) on porous glycidyl methacrylate-co-ethylene dimethacrylate monolith in capillary format ...
Al-Othman, Carrasco-Correa, Carrasco-Correa, Carrasco-Correa, Castells, Chankvetadze, Chankvetadze, Chen, Connolly, Connolly, Currivan, Dixit, Dong, Eeltink, Fanali, Fanali, Girod, Guerrouache, He, Hernández-Borges, Hilder, Huang, Hödl, Ling, Lv, Lämmerhofer, Meyring, Ou, Peters, Peters, Preinerstorfer, Preinerstorfer, Pucci, Qin, Qin, Rohr, Schmid, Stachowiak, Stachowiak, Tian, Vonk, Wu, Zheng   +42 more
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Enantioselective cycloaddition reactions

ChemInform, 1991
Publisher Summary This chapter reviews the cycloadditions reactions because they are popular, widely used, and also constitutes enormous body of chemistry. The chapter focuses on the landmark achievements as well as state-of-the-art examples of relevant chemistry.
openaire   +2 more sources