Results 121 to 130 of about 32,736 (165)

Base-Free Dynamic Kinetic Resolution of Secondary Alcohols Using “Piano-Stool” Complexes of N-Heterocyclic Carbenes

Organometallics, 2007
“Piano-stool” complexes of rhodium and iridium activated by fluorinated and non-fluorinated N-heterocyclic carbene (NHC) ligands were shown to be catalysts for racemization in the one-pot chemoenzymic dynamic kinetic resolution (DKR) of secondary alcohols.
Marr, Andrew, Pollock, C.L., Saunders, Graham   +2 more
openaire   +2 more sources

Borrowing hydrogen C-alkylation with secondary saturated heterocyclic alcohols

Organic & Biomolecular Chemistry
Access to functionalized saturated N- and O-heterocycles via the metal catalyzed borrowing hydrogen methodology.
Jordan François, Maïwenn Jacolot, Florence Popowycz   +2 more
openaire   +2 more sources

Kinetics and mechanism of the oxidation of some heterocyclic secondary alcohols by N-bromoacetamide in acid medium

Journal of the Chemical Society, Perkin Transactions 2, 1985
The kinetics of oxidation of 12 epimeric pairs of 1-hetera-2,6-diphenylcyclohexan-4-ols by N-bromoacetamide in the presence of perchloric acid in aqueous acid have been investigated. The oxidation is first-order in both oxidant and substrate and of minus-one-order in acetamide (an intermediate in the reaction) at constant acid concentration.
Marimuthu Jambulingam, Palaniappan Nanjappan, Kumarasamy Natarajan, Jpgiah Nagalingam, Maran Palaniswamy, Nanjan Sivakumar, Venkatasamy Prekumar, Krishnaswamy Ramarajan   +7 more
openaire   +1 more source

ChemInform Abstract: (N‐Heterocyclic Carbene)‐Pd‐Catalyzed Anaerobic Oxidation of Secondary Alcohols and Domino Oxidation—Arylation Reactions.

ChemInform, 2011
AbstractIt is found that the Pd complexes (I) and (II) efficiently promote the title reactions.
Brant Landers, Christophe Berini, Chao Wang, Oscar Navarro   +3 more
openaire   +1 more source

ChemInform Abstract: Homogeneous, Anaerobic (N‐Heterocyclic Carbene)—Pd or —Ni Catalyzed Oxidation of Secondary Alcohols at Mild Temperatures.

ChemInform, 2010
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Christophe Berini, Daniel F. Brayton, Corey Mocka, Oscar Navarro   +3 more
openaire   +1 more source

N-Heterocyclic carbene-catalyzed SuFEx reactions of fluoroalkylated secondary benzylic alcohols

Organic & Biomolecular Chemistry
An N-heterocyclic carbene (NHC)-catalyzed SuFEx reaction of fluoroalkylated secondary benzylic alcohols with sulfonyl fluorides and fluorosulfates affords fluorinated sulfonates and sulfates in high yields.
Zhihang Wei, Fang Zhang, Qichao Zhang, Zhihua Cai, Lin He, Guangfen Du   +5 more
openaire   +2 more sources

Rapid and Selective Catalytic Oxidation of Secondary Alcohols at Room Temperature by Using (N‐Heterocyclic Carbene)–Ni⁰ Systems

Chemistry – A European Journal, 2010
AbstractThe selective, anaerobic catalytic oxidation of secondary alcohols at room temperature by using an in situ (N‐heterocyclic carbene)–Ni0 system is presented. The use of non‐anhydrous, non‐degassed 2,4‐dichlorotoluene as both the oxidant and the solvent allows for very short reaction times and very high yields.
Christophe, Berini, Ole H, Winkelmann, Jennifer, Otten, David A, Vicic, Oscar, Navarro   +4 more
openaire   +2 more sources

ChemInform Abstract: N‐Heterocyclic Carbene Based Ruthenium‐Catalyzed Direct Amide Synthesis from Alcohols and Secondary Amines: Involvement of Esters.

ChemInform, 2012
AbstractThe Ru‐complex in combination with KOtBu efficiently promotes the coupling of alcohols with secondary amines.
Cheng Chen, Yao Zhang, Soon Hyeok Hong
openaire   +1 more source

Enhanced Rate and Selectivity by Carboxylate Salt as a Basic Cocatalyst in Chiral N-Heterocyclic Carbene-Catalyzed Asymmetric Acylation of Secondary Alcohols

Journal of the American Chemical Society, 2013
The rate and enantioselectivity of chiral NHC-catalyzed asymmetric acylation of alcohols with an adjacent H-bond donor functionality are remarkably enhanced in the presence of a carboxylate cocatalyst. The degree of the enhancement is correlated with the basicity of the carboxylate. With a cocatalyst and a newly developed electron-deficient chiral NHC,
Satoru, Kuwano, Shingo, Harada, Bubwoong, Kang, Raphaël, Oriez, Yousuke, Yamaoka, Kiyosei, Takasu, Ken-ichi, Yamada   +6 more
openaire   +2 more sources

An Efficient and Recyclable Catalyst for N‐Alkylation of Amines and β‐Alkylation of Secondary Alcohols with Primary Alcohols: SBA‐15 Supported N‐Heterocyclic Carbene Iridium Complex

Advanced Synthesis & Catalysis, 2013
AbstractA mesoporous silica (SBA‐15)‐supported pyrimidine‐substituted N‐heterocyclic carbene iridium complex was prepared and used as a catalyst for both environmentally friendly N‐alkylation of amines and β‐alkylation of secondary alcohols with primary alcohols.
Dong Wang, Xu‐Qing Guo, Chen‐Xi Wang, Ya‐Nong Wang, Rui Zhong, Xiao‐Han Zhu, Li‐Hua Cai, Zi‐Wei Gao, Xiu‐Feng Hou   +8 more
openaire   +1 more source