Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 172418-32-5, is researched, SMILESS is CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1, Molecular C46H46O4P2Pd2Journal, Advanced Synthesis & Catalysis called Efficient heterogeneously palladium-catalyzed Heck arylation of acrolein diethyl acetal. selective synthesis of cinnamaldehydes or 3-arylpropionic esters, Author is Noel, Sebastien; Luo, Ciahong; Pinel, Catherine; Djakovitch, Laurent, the main research direction is arylpropenal stereoselective preparation; arylpropionate preparation; acrolein diethyl acetal aryl bromide arylation palladium.Related Products of 172418-32-5.
A heterogeneous tetrakis-(ammine)palladium-NaY zeolite {[Pd(NH3)4]/NaY} catalyst was applied successfully to the Heck arylation of acrolein di-Et acetal using a large variety of aryl and heteroaryl bromides. Depending on the reaction conditions (Heck vs. Cacchi) good to high selectivities toward the 3-arylpropionic esters or to the cinnamaldehydes were achieved, resp. Under classical Heck conditions, while the catalyst was found to be stable over the two first runs, it showed significant loss of activity from the third cycle. Under Cacchi conditions, the catalyst could not be reused as it led to high dehalogenation rates. All results indicate that the reactions proceed through dissolved palladium species in the bulk solution (leaching). As observed by transmission electronic microscopic (TEM) analyses, while these species can be trapped and stabilized by the zeolite framework under the Heck conditions, they tend to form large palladium(0) aggregates under the Cacchi conditions leading to dehalogenation rather than to the expected Heck coupling.
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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate