Results 81 to 90 of about 20,772 (274)

Catalytic Functionalization of Unactivated π‐Bonds Enabled by Bidentate Directing Auxiliaries

Angewandte Chemie, EarlyView.
This review explores how bidentate directing auxiliaries have advanced transition‐metal catalysis for unactivated alkene/alkyne functionalization. By leveraging chelated intermediates, bidentate directing auxiliaries enable precise hydrofunctionalization, difunctionalization, and C─H activation of π‐bonds with unique selectivity and reactivity.
Seunghyeon Cho, Al Vicente Riano D. Lisboa, Juntao Sun, Taeho Kang, Keary M. Engle   +4 more
wiley   +2 more sources

Catalytic Enantioselective Intramolecular Aza‐Michael Addition to α,β‐Unsaturated Esters

Angewandte Chemie, EarlyView.
A general method for accessing enantioenriched saturated N‐heterocycles via a catalytic enantioselective intramolecular aza‐Michael reaction to α,β‐unsaturated esters is described. A superbasic bifunctional iminophosphorane (BIMP) catalyst was key to enabling reactivity of the high pKa sulfonamide pronucleophile, whilst delivering good to excellent ...
Evan G. W. Rutter, Cameron J. MacRae, Haoran Xiong, Daniel Rozsar, Katherine F. P. Clarke, Darren J. Dixon   +5 more
wiley   +2 more sources

Photooxidation of Benzyl Alcohols with Immobilized Flavins

, 2009
Benzyl alcohols are oxidized cleanly and efficiently to the corresponding aldehydes under irradiation using flavin photocatalysts and aerial oxygen as the terminal oxidant in homogeneous aqueous solution. Turnover frequencies (TOF) of more than 800 h(-1)
Burkhard König, Hilgers, Petra, Lechner, Robert, Robert Lechner, Harald Schmaderer, Petra Hilgers, König, Burkhard, Schmaderer, Harald   +7 more
core   +1 more source

Non‐Dilute Synthesis of Macrodiolides and Macrotetrolides Enabled by Confinement Catalysis

Angewandte Chemie, EarlyView.
Confinement catalysis within a hexameric resorcin[4]arene capsule enables macrolactonization under non‐dilute conditions (up to 0.1 M), overcoming the limitations of high‐dilution protocols (0.1–10 mM). This strategy provides direct access to 18–32‐membered macrodiolides and 26–32‐membered macrotetrolides in one pot and unlocks previously inaccessible ...
Feng‐Yuan Wang, Alessandro Prescimone, Daniel Häussinger, Konrad Tiefenbacher   +3 more
wiley   +2 more sources

FeCl₃·6H₂O Catalyzed Disproportionation of Allylic Alcohols and Selective Allylic Reduction of Allylic Alcohols and Their Derivatives with Benzyl Alcohol

, 2016
Iron chloride has been found to be an efficient catalyst for the disproportionation of allylic alcohols, which provides a convenient method for selective transformation of allylic alcohols to alkenes and α,β-unsaturated ketones.
Jialiang Wang (115197), Xu Xiang (782040), Wen Huang (186929), Ruiting Liu (2168947), Xigeng Zhou (1701397), Zhengxing Zhang (481001)   +5 more
core   +3 more sources

Specific Ion Effects of Chaotropic and Superchaotropic Anions Probed by Raman Hydration‐Shell Spectroscopy

Angewandte Chemie, EarlyView.
The vibrational frequencies of “dangling” water O─H bonds can be determined by Raman hydration‐ shell spectroscopy and used to differentiate chaotropes from kosmotropes and hydrophobes. Dangling O─H bonds are also detected around superchaotropic anions of the borate cluster type (B12X122−; X = H, F, Cl, Br, and I) but their frequencies do not directly ...
Werner M. Nau, Denilson Mendes de Oliveira, Andres S. Urbina, Harald Knorke, Jonas Warneke, Andrea Barba‐Bon, Dor Ben‐Amotz   +6 more
wiley   +2 more sources

Synthesis and fungicidal activity of some alkyl – 2,4 – dinitrobenzenesulfenate esters

Journal of Applied Sciences and Environmental Management, 2010
2,4-dinitrobenzenesulfenyl chloride was prepared by reacting 2,4-dinitrochlorobenzene with benzyl mercaptan and subsequently cracking the formed 2,4-dinitrophenyl benzyl sulphide with sulfuryl chloride.
FE Adewolo, IAO Ojo, OA Olu-Arotiowa
doaj   +3 more sources

Direct Arylation/Alkylation/Magnesiation of Benzyl Alcohols in the Presence of Grignard Reagents via Ni‑, Fe‑, or Co-Catalyzed sp³ C–O Bond Activation

, 2016
Direct application of benzyl alcohols (or their magnesium salts) as electrophiles in various reactions with Grignard reagents has been developed via transition metal-catalyzed sp3 C–O bond activation.
Lei Wang (6656), Ru-Yi Zhu (1321170), Bi-Qin Wang (809102), Xiao-Bo Zhang (2045404), Da-Gang Yu (1555045), Xin Wang (91924), Shuang Luo (18856), Zhang-Jie Shi (1474648)   +7 more
core   +1 more source

Single‐Atom Iron‐Catalyzed Oxidative Esterification: From Methylarenes to the Upcycling of Polystyrene and Lignin‐Derived Feedstocks

Angewandte Chemie, EarlyView.
Heterogeneous iron‐catalyzed environmentally benign and sustainable CH‐oxidative esterification methodology has been developed for the synthesis of esters. This challenging reaction has been achieved by the rational design of specific single atom iron‐based catalyst with Fe‐N4 active centers, which empowered the oxidative esterification of methyl and ...
Zhuang Ma, Binyu Zhang, Hui Yang, Yue Hu, Junzheng Yu, Yanbin Cui, Jun Zhao, Matthias Beller, Rajenahally V. Jagadeesh   +8 more
wiley   +2 more sources

A Ru-Based Complex for Sustainable One-Pot Tandem Aerobic Oxidation-Knoevenagel Condensation Reactions

Molecules
Our novel binuclear complex-anchored Ru(III) catalyst, designed and assembled by sonicating 2,2′-(4,6-dihydroxy-1,3-phenylene)bis(1H-benzo[d]imidazole-4-carboxylic acid), Ru(DMSO)4Cl2 and 4-methylpyridine, demonstrates remarkable efficiency and ...
Wael A. A. Arafa, AbdElAziz A. Nayl, Ismail M. Ahmed, Ayman M. S. Youssef, Asmaa K. Mourad, Stefan Bräse   +5 more
doaj   +1 more source