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oe1(光电查) - 科学论文

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  • Controlled Hydrogenation of Alkynes on Photogenerated Palladium Nanoparticles

    摘要： A palladium nanoparticles–bisacyl-phosphine oxide composite (PdNPs@BAPO) was prepared by treatment of Pd(OAc)2 under UV irradiation using bis(mesitylcarbonyl)(phenyl)phosphine oxide as a photoinitiator (eq. 1). PdNPs@BAPO catalyzed the controlled hydrogenation of alkynes under H2 to give the corresponding (Z)-alkenes in up to 99% yield and up to 99:1 Z/E selectivity (eq. 2; 18 examples).

    关键词： palladium catalysis,hydrogenation,nanoparticles,alkynes,alkenes,light-mediated synthesis

    更新于2025-09-23 15:19:57

  • Direct C–H Arylation Polymerization to form Anionic Water-Soluble Poly(3,4-ethylenedioxythiophenes) with Higher Yields and Molecular Weights

    摘要： A facile and environmentally benign Pd-catalyzed direct C–H arylation polymerization (DAP) has been developed for the syntheses of homo- and copolymers of anionic-group-functionalized 3,4-ethylenedioxythiophenes with high yields (up to 99%), high molecular weights, and narrow polydispersities. The effects of various Pd catalysts, phosphine ligands, and additives on the properties of the polymers have been examined. The method gives anionic poly(3,4-ethylenedioxythiophenes) with higher molecular weights than those produced by the previously reported chemical or electrochemical methods. The method was also used to synthesize polymers functionalized with carboxylic acid groups without the need for protection/deprotection steps. The resulting polymers can be processed from water or highly polar organic solvents. We also demonstrated a phosphine-free, water-mediated, Pd-catalyzed DAP. The anionic poly(3,4-ethylenedioxythiophenes) were stable in water, and are promising for applications in sensors, drug delivery, and cell engineering.

    关键词： polyethylenedioxythiophenes,C–H arylation,polymerization,anionic polymers,step-economic syntheses,palladium catalysis

    更新于2025-09-10 09:29:36

  • Enantioselective Allylic Alkylation with 4-Alkyl-1,4-dihydropyridines Enabled by Photoredox/Palladium Cocatalysis

    摘要： Highly regio-, and enantioselective allylic alkylation has been achieved enabled by the merger of photoredox and palladium catalysis. In this dual catalytic process, alkyl radicals generated from 4-alkyl-1,4-dihydropyridines act as the coupling partners of the π-allyl palladium complexes. The generality of this method has been illustrated through the reaction of a variety of allyl esters with 4-alkyl-1,4-dihydropyridines. This mechanistically novel strategy expands the scope of the traditional Pd-catalyzed asymmetric allylic alkylation reaction and serves as its alternative and potential complement.

    关键词： π-Allyl Palladium Complexes,Palladium Catalysis,4-Alkyl-1,4-dihydropyridines,Photoredox Catalysis,Enantioselective Allylic Alkylation

    更新于2025-09-09 09:28:46