alkylation, and trifluoromethanesulfonic acid (triflic acid, TfOH) was also a good catalyst. The catalytic activity of metal triflates and TfOH increased in the order La(OTf)3 < Yb(OTf)3 < TfOH < Sc(OTf)3 < Hf(OTf)4. A mechanistic study was also performed. The reaction of 1-phenylethanol (4a) in the presence of Sc(OTf)3 in nitromethane gave an equilibrium mixture of 4a and bis(1-phenylethyl) ether (54). Addition
Highly efficient gold(III)-catalyzed intermolecular hydroarylation of unactivated alkenes with arenes under mild conditions
作者:Ya-Ping Xiao、Xin-Yuan Liu、Chi-Ming Che
DOI:10.1016/j.jorganchem.2008.07.035
日期:2009.2
heteroarenes with unactivated alkenes by Au(III)-catalyzedintermolecularhydroarylationunder mild reaction conditions was developed. This method features a short reaction time (5 h) under mild conditions and has a broad substrate scope, including electron-rich arenes and heteroarenes, terminal and internal substituted aryl alkenes, and unactivated aliphatic alkenes.
Ni(<scp>ii</scp>) source as a pre-catalyst for the cross-coupling of benzylic pivalates with arylboronic acids: facile access to tri- and diarylmethanes
作者:Qiang Chen、Xin-Heng Fan、Li-Peng Zhang、Lian-Ming Yang
DOI:10.1039/c4ra16452k
日期:——
Various di- and triarylmethanes were synthesized via NiII–(σ-aryl) complex-catalyzed Suzuki–Miyaura cross-coupling of benzylic pivalates with arylboronic acids under mild conditions.
Silver catalyzed substitution of allylic and benzylic alcohols having unactivated hydroxy groups
作者:Hossein Barzegar、Clayton P. Donald、Andrew Isho、Po-Kai Peng、Jeremy A. May
DOI:10.1016/j.tetlet.2023.154572
日期:2023.7
The catalytic Friedel-Crafts substitution of allylic and benzylic alcohols having free hydroxygroups was regioselectively catalyzed by cationic Ag(I) salts. No precautions to exclude moisture or atmosphere were necessary, making the reaction highly robust and facile. Substitution of allylic alcohols with electron rich aromatic nucleophiles favored products with alkenes conjugated to aromatic substituents
NHC as a Ligand in Heterobimetallic Catalysis: An Insight into a Catalytic Friedel–Crafts-like Reaction
作者:Mukesh Kumar Nayak、Anuradha Mohanty、Sujit Roy
DOI:10.1021/acs.organomet.3c00177
日期:2023.8.14
calculation of local reactivity descriptors, namely, local electron density and the Fukui function index for nucleophilic attack at a center, established that in transition metal–tin heterobimetallic complexes, N-heterocyclic carbene (NHC) is a better ligand than its alkene and phosphine analogues for the coupling of C–H and C–OH bonds. This insight was verified by synthesizing a new complex (NHC)2Pd(Br)(SnCl3)