Results 101 to 110 of about 42,802 (288)

Metal Nanoparticles on Halloysite Applied in Stereoselective Hydrogenation of Tetrasubstituted Alkenes

Chemistry – A European Journal, EarlyView.
Composite materials based on metal nanoparticles supported on a naturally occurring nanotubular clay, halloysite (HAL), led to the diastereoselective hydrogenation of tetra‐substituted alkenes under relatively smooth conditions, mainly oxazolidinone‐based heterocycles.
Rosa Pich, Gabriel Domínguez, Leo Westrey, Pierre Lavedan, Sonia Mallet‐Ladeira, Jérôme Esvan, Jean‐François Lahitte, Jean‐Christophe Remigy, Daniel Pla, Montserrat Gómez   +9 more
wiley   +1 more source

Chiral separation by enantioselective liquid–liquid extraction [PDF]

, 2011
The literature on enantioselective liquid–liquid extraction (ELLE) spans more than half a century of research. Nonetheless, a comprehensive overview has not appeared during the past few decades.
Feringa, Ben L.,, Heeres, Hero J.,, Minnaard, Adriaan J.,, Schuur, Boelo,, Verkuijl, Bastiaan J.V.,, Vries, Johannes G. de,   +5 more
core   +3 more sources

Better Material Properties and Faster Catalyzed Chemical Recycling for Poly(L‐Lactide) Using a Simple Commercial Glycerol Ethoxylate Additive

Chemistry – A European Journal, EarlyView.
Glycerol ethoxylate (GEO), a branched ethylene glycol derivative, both toughens commercial PLLA and accelerates its chemical recycling to L‐lactide. The lead sample, containing 10 wt.% GEO, shows 9x higher elongation at break and 6x higher tensile toughness than pure PLLA. The GEO–PLLA samples are efficiently chemically recycled to L‐lactide, even when
Madeleine L. Smith, Thomas M. McGuire, Kam C. Poon, Alexander R. Craze, Charlotte K. Williams   +4 more
wiley   +1 more source

Bidentate N,O-prolinate ruthenium benzylidene catalyst highly active in RCM of disubstituted dienes [PDF]

, 2007
The synthesis of a bidentate N,O-prolinate ruthenium benzylidene from commercially available starting materials and its activity in ring-closing metathesis of functionalized disubstituted dienes at 30 °C is ...
Grubbs, Robert H., Samec, Joseph S. M.
core   +3 more sources

Asymmetric Reduction of Unactivated Alkenes

Chemistry – A European Journal, EarlyView.
Unactivated alkenes rank among the most inert functional groups in synthesis and their selective reduction remains challenging. This Review charts the evolution from classical metal‐catalyzed hydrogenation to radical hydrogen atom transfer (HAT) and emerging biocatalytic concepts, highlighting how complementary mechanistic strategies, including the ...
Nico D. Fessner, Sebastian Roth, Richard Niese, Michael Müller   +3 more
wiley   +1 more source

Enantioselective Esterification of Ibuprofen under Microwave Irradiation

Molecules, 2013
Enantioselective esterification of ibuprofen has been successfully carried out in an organic solvent catalyzed by recombinant APE 1547 (a thermophilic esterase from the archaeon Aeropyrum pernix K1). Here we used microwave irradiation (MW) as the mode of
Dantong Zhao, Lei Wang, Hong Yue, Hong Zhang, Xuedong Fang, Ge Chen, Xuedun Niu, Zecheng Yang, Zhi Wang   +8 more
doaj   +1 more source

Synthesis of several bisabolane sesquiterpenoids from xanthorrhizol isolated from C. Xanthorrhiza [PDF]

, 2005
Xanthorrhizol was isolated from the essential oil of fresh rhizomes of C. xanthorrhiza in 20.2% yield by fractionation using vacuum liquid chromatography. Several bisabolane-type sesquiterpenoids have been synthesised from this xanthorrhizol.
Ngai, Mun Hong
core  

Bifunctional Photocatalysts: Exploiting Proximity for Enhanced Reaction Performance

Chemistry – A European Journal, EarlyView.
This review covers the application of the bifunctional approach to photocatalysis as a means to attain (enhanced) enantioselectivity, and, more in general, as a strategy to enhance the catalytic performance through an effective use of short‐lived reaction intermediates.
Luigi Dolcini, Daniele Lavelli, Alberto Dal Corso, Luca Pignataro   +3 more
wiley   +1 more source

NiH-Catalyzed Enantioconvergent α-Alkenylation of Carbonyl Compounds via Markovnikov Alkyne Hydronickellation. [PDF]

Angew Chem Int Ed Engl
A NiH‐catalyzed α‐alkenylation via Markovnikov hydronickellation of alkynes enables convenient access to α‐chrial β‐methylene carbonyl frameworks that are prevalent in biorelevant molecules. High regio‐ and enantioselectivities have been achieved with excellent functional group tolerance and applicability toward complex structures. The β‐methylene unit
Nam H, Jang S, Kim D, Seo S.
europepmc   +3 more sources

Recent Advances in Enantioselective Photochemical Reactions of Stabilized Diazo Compounds

Molecules, 2019
Diazo compounds have proven to be a useful class of carbenes or metal carbenoids sources under thermal, photochemical, or metal-catalyzed conditions, which can subsequently undergo a wide range of synthetically important transformations.
Ting-Bi Hua, Qing-Qing Yang, You-Quan Zou   +2 more
doaj   +1 more source