Results 111 to 120 of about 166,370 (359)

Arylhydrazines: Convenient Homogeneous Reductants for Scalable Cross‐Coupling

open access: yesAngewandte Chemie, EarlyView.
Reductive cross‐couplings enable efficient C–C bond formation but are limited by the heterogeneity of Zn or costly reagents like TDAE. We report arylhydrazines as inexpensive, convenient reductants for Ni‐catalyzed sp2–sp3 coupling of aryl halides and secondary alkyl iodides. Mechanistic studies support hydrazine‐mediated NiII reduction for a NiI/NiIII
Nils Kurig   +5 more
wiley   +2 more sources

Systematic Chemoenzymatic Synthesis of O-Sulfated Sialyl Lewis x Antigens. [PDF]

open access: yes, 2015
O-Sulfated sialyl Lewis x antigens play important roles in nature. However, due to their structural complexity, they are not readily accessible by either chemical or enzymatic synthetic processes.
Chen, Xi   +8 more
core   +1 more source

N-Heterocyclic carbene/Brønsted acid cooperative catalysis as a powerful tool in organic synthesis

open access: yesBeilstein Journal of Organic Chemistry, 2012
The interplay between metals and N-heterocyclic carbenes (NHCs) has provided a window of opportunities for the development of novel catalytic strategies within the past few years.
Rob De Vreese, Matthias D’hooghe
doaj   +1 more source

Highly selective electrochemical hydrogenation of alkynes: Rapid construction of mechanochromic materials [PDF]

open access: yes, 2019
Electrochemical hydrogenation has emerged as an environmentally benign and operationally simple alternative to traditional catalytic reduction of organic compounds.
Ge, Haibo, Li, Bijin
core   +1 more source

Synthesis of Chiral Acyclic Pyrimidine Nucleoside Analogues from DHAP-Dependent Aldolases

open access: yesBiomolecules
Dihydroxyacetone phosphate (DHAP)-dependent aldolases catalyze the aldol addition of DHAP to a variety of aldehydes and generate compounds with two stereocenters.
Mariano Nigro   +7 more
doaj   +1 more source

Biocatalytic preparation and absolute configuration of enantiomerically pure fungistatic anti-2-benzylindane derivatives. Study of the detoxification mechanism by Botrytis cinerea [PDF]

open access: yes, 2010
Enantiomerically pure 2-benzylindane derivatives were prepared using biocatalytic methods and their absolute configuration determined. (1R,2S)-2-Benzylindan-1-ol ((1R,2S)-2) and (S)-2-benzylindan-1-one ((S)-3) were produced by fermenting baker’s yeast.
Aleu   +23 more
core   +2 more sources

Stereoselective cyclo-addition reactions of azomethine ylides catalysed by in situ generated Ag(I)/bisphosphine complexes [PDF]

open access: yesJournal of the Serbian Chemical Society, 2010
Stereoselective cyclo-addition reactions of azomethine ylides promoted by in situ generated Ag(I)/bisphosphine complexes were studied. Under the optimised conditions, the pyrrolidine products were isolated in up to 84 % yield and with up to 71 % e.e. The
VLADIMIR SAVIĆ   +2 more
doaj  

Polyethers for biomedical applications. Polymerization of propylene oxide by organozinc/organotin catalysts [PDF]

open access: yes, 1987
The polymerization of propylene oxide to obtain a high-molecular-weight polymer with an atactic structure required for the application as artificial blood vessels was investigated using combinations of organozinc and organotin compounds as catalyst.
Bantjes, Adriaan   +3 more
core   +2 more sources

Preparation of 4 '-spirocyclobutyl nucleoside analogues as novel and versatile adenosine scaffolds

open access: yes, 2019
Despite the large variety of modified nucleosides that have been reported, the preparation of constrained 4 '-spirocyclic adenosine analogues has received very little attention.
De Vleeschouwer, Freija   +10 more
core   +1 more source

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