Results 111 to 120 of about 27,871 (287)

Modern Methods for Conjugated Polymers Preparation: A Concept of Transition Metal‐Free Synthesis

open access: yesEuropean Journal of Organic Chemistry, Volume 28, Issue 2, January 10, 2025.
Conjugated polymers (CPs) are promising organic materials currently at the center of the organic electronics revolution. Synthesis strategies play a crucial role in the rise of this field, and this review aims to shed light on transition metal‐free organic chemistry for the synthesis of conjugated polymers, which is currently experiencing a renaissance.
Tomaž Kotnik, Sebastijan Kovačič
wiley   +1 more source

Application of 1,3-Dipolar Reactions between Azomethine Ylides and Alkenes to the Synthesis of Catalysts and Biologically Active Compounds [PDF]

open access: yes, 2018
The (3+2) cycloaddition between azomethine ylides and alkenes is an efficient, convergent and stereocontrolled method for the synthesis of unnatural pyrrolidine and proline scaffolds.
Arrastia, Iosune   +2 more
core   +1 more source

Enantioselective Organozinc Addition to Aldehydes Using Planar Chiral [2.2]Paracyclophane‐Imidazoline N,O‐Ligands

open access: yesChemistry – A European Journal, Volume 30, Issue 72, December 23, 2024.
A convenient synthesis of planar chiral [2.2]paracyclophane imidazoline N,O‐ligands has been developed. The application of these classes of ligands showed excellent performance in organozinc additions to aldehydes. An improved seven‐step synthesis of [2.2]paracyclophane‐imidazoline N,O‐ligands (UCD‐Imphanols) possessing both central and planar ...
Sundaravel Vivek Kumar, Patrick J Guiry
wiley   +1 more source

New Chemistry of Imidazolinium ylides [PDF]

open access: yes, 2001
Previous work in this group has shown 4,5-dihydroimidazolium ylides, formed by N- alkylation of 4,5-dihydroimidazoles, to undergo 1,3-dipolar cycloadditions with a range of dipolarophiles in a highly regio- and stereoselective fashion.
Lory, Pedro M. J.
core   +1 more source

Total Synthesis of (−)-Daphenylline [PDF]

open access: yes, 2016
Total synthesis of (−)-daphenylline, a hexacyclic Daphniphyllum alkaloid, was achieved. Construction of the tricyclic DEF ring system was initiated by asymmetric Negishi coupling followed by an intramolecular Friedel–Crafts reaction.
67333   +7 more
core   +1 more source

One pot synthesis of pyrrolidines type 3,7-diazabicyclo [3.3.0] octane and biological activity [PDF]

open access: yes, 2008
Pyrrolidines type 2,4-disubstituted (alkyl, aryl or heteroaryl)-6,8-dioxo-3,7-diazabicyclo [3.3.0] octanes (8a-d) were successfully synthesized by an efficient one pot 1,3-dipolar cycloaddition of azomethine ylides (in situ generated from the reaction of
Amornraksa, Kitti   +2 more
core  

Highly diastereoselective synthesis of substituted pyrrolidines using a sequence of azomethine ylide cycloaddition and nucleophilic cyclization [PDF]

open access: yes, 2010
: Although cycloadditions of azomethine ylides usually give mixtures of endo/exo adducts, we successfully tuned the mechanistic path of a new reaction cascade to afford substituted pyrrolidines in high yields and diastereomeric purity.
Achiwa K.   +30 more
core   +1 more source

Strecker degradation of amino acids promoted by a camphor-derived sulfonamide [PDF]

open access: yes, 2016
A camphor-derived sulfonimine with a conjugated carbonyl group, oxoimine 1 (O2SNC10H13O), reacts with amino acids (glycine, L-alanine, L-phenylalanine, L-leucine) to form a compound O2SNC10H13NC10H14NSO2 (2) which was characterized by spectroscopic means
Carvalho, M. Fernanda N. N.   +6 more
core   +4 more sources

Addition of azomethine ylides to carbon-encapsulated iron nanoparticles

open access: yesDalton Transactions, 2018
Carbon-encapsulated iron nanoparticles have been covalently functionalized using the Prato reaction.
Artur Kasprzak   +6 more
openaire   +4 more sources

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