Results 81 to 90 of about 16,879 (311)

Mechanochemistry assisted asymmetric organocatalysis: A sustainable approach

open access: yesBeilstein Journal of Organic Chemistry, 2012
Ball-milling and pestle and mortar grinding have emerged as powerful methods for the development of environmentally benign chemical transformations. Recently, the use of these mechanochemical techniques in asymmetric organocatalysis has increased.
Pankaj Chauhan, Swapandeep Singh Chimni
doaj   +1 more source

Pursuing Chemical Efficiency by Using Supported Organocatalysts for Asymmetric Reactions under Aqueous Conditions [PDF]

open access: yes, 2015
Over the past decade, a great effort has been made by the chemical community to improve the efficiency of organic transformations and allow sustainable processes.
Alonso, Diego A.   +6 more
core   +2 more sources

Development of a general, enantioselective organocatalytic Mukaiyama-Michael reaction with α,β-unsaturated aldehydes [PDF]

open access: yes, 2009
LUMO-lowering organocatalysis has been extended to promote the conjugate addition of S-alkyl and 1-pyrrolyl silylketene acetals to α,β-unsaturated aldehydes, yielding both, syn and anti Mukaiyama–Michael products with high levels of enantioselectivity ...
Borths, Christopher J.   +2 more
core   +1 more source

Reaction Mechanism of Organocatalytic Michael Addition of Nitromethane to Cinnamaldehyde: A Case Study on Catalyst Regeneration and Solvent Effects [PDF]

open access: yes, 2017
The Michael addition of nitromethane to cinnamaldehyde has been computationally studied in the absence of a catalyst and the presence of a biotinylated secondary amine by a combined computational and experimental approach. The calculations were performed
Luk, Louis Y. P.   +4 more
core   +4 more sources

ORGANOCATÁLISE ENANTIOSSELETIVA: EVOLUÇÃO E ASPECTOS RECENTES

open access: yesQuímica Nova
In the last two decades, enantioselective organocatalysis has established itself as one of the three pillars of asymmetric catalysis. The rapid growth in the area is due to the rationalization of organocatalysis based on the generic modes of catalyst ...
Fernanda G. Finelli   +2 more
doaj   +1 more source

Spotting trends in organocatalysis for the next decade

open access: yesNature Communications, 2020
After two decades of steady growing, symbiotic merger of organocatalysis with emerging electrochemical and photochemical tools are envisioned as hot topics in the coming decade.
José M. Lassaletta
doaj   +1 more source

Solvent-free synthesis of enantioenriched β-silyl nitroalkanes under organocatalytic conditions

open access: yesBeilstein Journal of Organic Chemistry, 2021
An enantioselective 1,4-conjugate addition of nitromethane to β-silyl α,β-unsaturated carbonyl compounds catalyzed by bifunctional squaramide catalysts has been developed.
Akhil K. Dubey, Raghunath Chowdhury
doaj   +1 more source

Recent Advances in Asymmetric Organocatalyzed Conjugate Additions to Nitroalkenes [PDF]

open access: yes, 2017
The asymmetric conjugate addition of carbon and heteroatom nucleophiles to nitroalkenes is a very interesting tool for the construction of highly functionalized synthetic building blocks.
Alonso, Diego A.   +6 more
core   +3 more sources

Chiral phosphines in nucleophilic organocatalysis

open access: yesBeilstein Journal of Organic Chemistry, 2014
This review discusses the tertiary phosphines possessing various chiral skeletons that have been used in asymmetric nucleophilic organocatalytic reactions, including annulations of allenes, alkynes, and Morita–Baylis–Hillman (MBH) acetates, carbonates ...
Yumei Xiao   +3 more
doaj   +1 more source

(2R,4R)-2-Hydroxy-4-(2-methoxyphenyl)bicyclo[3.3.1]nonan-9-one

open access: yesActa Crystallographica Section E, 2009
The title compound, C16H20O3, contains a bicyclic ring system with two chiral centers. The crystal structure is stabilized by intermolecular O—H...O hydrogen bonds.
Shuping Luo   +4 more
doaj   +1 more source

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