The Palladium Component of an Immobilized Sonogashira Catalyst System: New Insights by Multinuclear HRMAS NMR Spectroscopy
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https://figshare.com/articles/dataset/The_Palladium_Component_of_an_Immobilized_Sonogashira_Catalyst_System_New_Insights_by_Multinuclear_HRMAS_NMR_Spectroscopy/2227867
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资源简介：
Multinuclear
one- and two-dimensional HRMAS NMR spectroscopy has
been used to investigate the palladium component of a Sonogashira
catalyst system immobilized on silica by diverse bifunctional phosphine
linkers incorporating Si(OEt)3 groups. The coordinating
strengths of these mono- and bidentate phosphine ligands have been
assayed in situ by competition experiments monitored with 31P HRMAS NMR spectroscopy. The ligand best retaining and scavenging
the PdCl2 fragment has been determined to be immobilized
(EtO)3Si(CH2)3N(CH2PCy2)2, while silica-bound (EtO)3Si(CH2)3NH2 and (EtO)3Si(CH2)3PPh2 led to leaching. The coordinating
strengths of the immobilized ligands have been correlated with the
catalytic activities of the corresponding immobilized Sonogashira
catalyst systems regarding the coupling of phenylacetylene with iodobenzene.
创建时间：
2014-12-08
