Evidence that SCS Pincer Pd(II) Complexes are only Precatalysts in Heck Catalysis and the Implications for Catalyst Recovery and Reuse
作者:Kunquan Yu、William Sommer、John?M. Richardson、Marcus Weck、Christopher?W. Jones
DOI:10.1002/adsc.200404264
日期:2005.1
SCS-pincer Pd(II) complexes have been covalently immobilized onto porous silica, cross-linked polymer (Merrifield resin) and soluble poly(norbornene) supports via either amide or urea linkages and evaluated in the Heck coupling of iodobenzene with n-butyl acrylate. Kinetic experiments and poisoning studies indicate that in all cases the pincer complexes merely act as precatalysts. Contrary to literature
A molecular gate attached on the pore outlet of a mesoporous material, which is opened and closed by redox system of thiol groups, effectively switched the progress of a catalytic reaction promoted by the acidic site in the pore void.
Calcium(II) catalyzed regioselective dehydrative cross-coupling reactions: Practical synthesis of internal alkenes and benzopyrans
作者:Srinivasarao Yaragorla、Abhishek Pareek、Ravikrishna Dada、Abdulrahman I. Almansour、Natarajan Arumugam
DOI:10.1016/j.tetlet.2016.11.027
日期:2016.12
the regioselectivesynthesis of internal alkenes through a dehydrative cross-coupling and direct coupling procedure has been described using the environmentally benign Ca(II) catalyst. Several alkenes and alcohols underwent the coupling reaction under solvent-free conditions in a short time to produce the desired alkenes. This method is further extended to show the application in the synthesis of novel
Amberlyst-15 in Ionic Liquid: An Efficient and Recyclable Reagent for Nucleophilic Substitution of Alcohols and Hydroamination of Alkenes
作者:Ziyauddin S. Qureshi、Krishna M. Deshmukh、Pawan J. Tambade、Kishor P. Dhake、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201000456
日期:2010.11
The nucleophilicsubstitutionreaction of secondary alcohols and hydroamination of alkenes with amides, sulfonamides, carbamates, and amines using Amberlyst-15 immobilized in [Bmim][BF 4] (1-butyl-3-methylimidazolium tetrafluoroborate) ionic liquid as an efficient recyclable reagent is described. The solvent effect is prominent in the reaction, and the desired substitution products are obtained in
The aminium salts-induced dimerization of α-methylstyrene 1b gives rise, depending on the solvent employed, to high yields of 1,3,3-trimethyl-1-phenylindane 2b, or 2,4-diphenyl-4-methyl-1-pentene 6b. Several 1-aryl-1-phenylethylenes 1a,c-e afford, instead, cyclodimers 2a,c-e, or 2,5-diaryl-2,5-diphenyltetrahydrofuran derivatives 3a,c-e.