Redox-photosensitized amination of alkenes and alkadienes with ammonia and alkylamines
摘要:
Using 1,2,4-triphenylbenzene as a photosensitizer, the photoamination of alkenes and alkadienes (1), which had no absorption at > 300 nm proceeded efficiently in the presence of p-dicyanobenzene to give addition products by incorporating both amino andp-cyanophenyl groups. The reaction efficiency was discussed in terms of the relationships between 1 and the photosensitizer in their oxidation potentials and the distribution of positive charge on the reaction site of the cation radical of 1 (1(+.)). (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis, characterization and catalytic application of some novel PNP-Ni(II) complexes: Regio-selective [2+2+2] cycloaddition reaction of alkyne
作者:Masilamani Tamizmani、Chinnappan Sivasankar
DOI:10.1016/j.jorganchem.2017.02.039
日期:2017.9
We have also performed alkyne [2+2+2] cycloaddition reaction using Ni(II) complexes and observed high regioselectivity of the products. The observed selectivity is well correlating with the electronic feature of alkynes. The [2+2+2] cycloaddition of electron rich alkynes produced 1,3,5-substituted benzene derivatives as a major product whereas the electron deficient alkynes produced 1,2,4-substituted
examples of an iron‐catalyzed three‐component synthesis of homoallylic boronates from regioselective union of bis(pinacolato)diboron, an alkenyl halide (bromide, chloride or fluoride), and an olefin are disclosed. Products that bear tertiary or quaternary carbon centers could be generated in up to 87 % yield as single regioisomers with complete retention of the olefin stereochemistry. With cyclopropylidene‐containing
A Simple and Highly Efficient Iron Catalyst for a [2+2+2] Cycloaddition to Form Pyridines
作者:Chunxiang Wang、Xincheng Li、Fan Wu、Boshun Wan
DOI:10.1002/anie.201102001
日期:2011.7.25
Joined by iron: The ironcatalyst for the formation of pyridines at room temperature (see scheme), which was generated in situ from an inorganic iron salt and a diphosphine ligand, exhibited high reactivity and regioselectivity.
Pd and Ni complexes of a novel vinylidene β-diketimine ligand: Their application as catalysts in Heck coupling and alkyne trimerization
作者:Raghavendra Beesam、Dastagiri Reddy Nareddula
DOI:10.1002/aoc.3696
日期:2017.9
A β‐diketimine ligand with vinylidene substitution at γ‐carbon, CH2C(CH3CNAr)2 (Ar = 2,6‐diisopropylphenyl) (L2), was synthesized by treating β‐diketimine H2C(CH3CNAr)2 with n‐BuLi followed by paraformaldehyde. L2 formed the homobimetallic ether‐bridged β‐diketiminatecomplex [O(CH2‐β‐diketiminate)Pd(OAc)}2] (1) with (PdOAc)2. It also gave complexes [L2PdCl2] (2) and [L2NiBr2] (3) when treated with