title: Catalysis and regioselectivity of the aqueous Heck reaction by Pd(0) nanoparticles under ultrasonic irradiation.
abstract: An aqueous Heck reaction carried out under ultrasonic irradiation at the ambient temperature (25 degrees C) has been shown in this study to afford high yields of corresponding products. It was found that as a catalyst for the reaction palladium forms nanoparticles in-situ, characterized by transmission electron microscopy (TEM) and X-ray powder diffraction (XRD) analyses, and can be recycled. Furthermore, the Heck reaction under such mild and environmentally friendly conditions offers excellent regioselectivity of para- over ortho-substitution in phenyl iodides especially with electron-donating groups.
authors.affiliation: Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026 PR China.
authors.forename: Zuhui
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zhenggen
authors.initials: Z
authors.lastname: Zha
authors.forename: Changsheng
authors.initials: C
authors.lastname: Gan
authors.forename: Chongfeng
authors.initials: C
authors.lastname: Pan
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Zhou
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Wang
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Zhou
mesh_terms: D002384:Catalysis; D053758:Nanoparticles / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D014465:Ultrasonics; D014867:Water
chemical_list: D014867:Water; D010165:Palladium