Search results for "Highly selective"

showing 2 items of 22 documents

tBuLi-Mediated One-Pot Direct Highly Selective Cross-Coupling of Two Distinct Aryl Bromides.

2015

A Pd-catalyzed direct cross-coupling of two distinct aryl bromides mediated by tBuLi is described. The use of [Pd-PEPPSI-IPr] or [Pd-PEPPSI-IPent] as catalyst allows for the efficient one-pot synthesis of unsymmetrical biaryls at room temperature. The key for this selective cross-coupling is the use of an ortho-substituted bromide that undergoes lithium-halogen exchange preferentially.

Stereochemistry22'-BIPYRIDINE COMPLEX2chemistry.chemical_elementORGANOLITHIUM COMPOUNDSCatalysisCatalysischemistry.chemical_compoundLOW-TEMPERATUREBromideOrganolithium compoundscross-couplingN-heterocyclic carbenesGRIGNARD-REAGENTSPD-PEPPSI-IPENT2'-BIPYRIDINE COMPLEXCARBON BOND FORMATIONArylOrganic ChemistryORGANIC-SYNTHESISGeneral ChemistryORTHO-SUBSTITUTED BIARYLSpalladiumHighly selectiveCombinatorial chemistryFUNCTIONALIZED ARYLCoupling (electronics)biarylschemistrylithiumOrganic synthesisUNSYMMETRICAL BIARYLSPalladiumChemistry (Weinheim an der Bergstrasse, Germany)
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A chalcone-based highly selective and sensitive chromofluorogenic probe for trivalent metal cations

2015

[EN] Anew chalcone-based probe for the chromofluorogenic sens-ing of trivalent (Al3 +,Fe3+,Cr3+,Ga3+,In3+and As3 +)overmono-and divalent cationsand anionsisreported. In the presence of trivalent metal cations,the probe was able to displayaremarkable color change from yellow to colorless that wasclearly visible to the naked eye. Also, the initial strongyellowemission was gradually quenched and substituted by aweaklyshifted band.

chemistry.chemical_classificationChalconeQUIMICA INORGANICAGeneral ChemistryHighly selectivePhotochemistrysensorstrivalent cationsDivalentchalcone-based probeMetalchemistry.chemical_compoundchromofluorogenic sensingQUIMICA ORGANICAchemistryvisual_artQUIMICA ANALITICAvisual_art.visual_art_mediumNaked eyeanions
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