In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Quality Control of Bis(dibenzylideneacetone)palladium, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 32005-36-0, name is Bis(dibenzylideneacetone)palladium. In an article£¬Which mentioned a new discovery about 32005-36-0
Diazadiene als Steuerliganden in der homogenen Katalyse XIII. Cocyclotetramerisierung zweier verschiedener Alkine ueber ein Palladacyclopentadien zu einem Cyclooctatetraen
The reaction of bis(dibenzylideneacetone)palladium with N-arylazadienes (dad =ArN=CR’CR’=NAr) in the presence of dialkylacetylene dicarboxylate V gives the dad-stabilized palladacyclopentadiene I.This complex is a precatalyst for the cyclotrimerization of V and other alkynes.With 3-methyl-1-butyne-3-ol IV and the diester V a 1/2-cyclotrimer is formed catalytically, which contains a gamma-lactone ring resulting from intramolecular transesterification.No mellitic acid ester was formed in this experiment, nor was it formed in an analogous reaction with 1-trimethylsilyl-1-propyne-3-ol IX and V, which gave the corresponding 2(3H)-benzofuranone X (75percent) together with a second product XI (25percent).XI is a 1/3 cocyclotetramer of IX and V, again with a lactone ring fused to the cyclooctatetraene.XI is the first octa-substituted cyclooctatetraene formed catalytically from two different alkynes.
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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method