Synthesis of triphenylphosphonium vitamin E derivatives as mitochondria-targeted antioxidants
摘要:
A series of mitochondria-targeted antioxidants comprising a lipophilic triphenylphosphonium cation attached to the antioxidant chroman moiety of vitamin E by an alkyl linker have been prepared. The synthesis of a series of mitochondria-targeted vitamin E derivatives with a range of alkyl linkers gave compounds of different hydrophobicities. This work will enable the dependence of antioxidant defence on hydrophobicity to be determined in vivo. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.
Highly efficient AgBF4-catalyzed synthesis of methyl ketones from terminal alkynes
作者:Zheng-Wang Chen、Dong-Nai Ye、Yi-Ping Qian、Min Ye、Liang-Xian Liu
DOI:10.1016/j.tet.2013.05.057
日期:2013.7
A silver-catalyzed highlyefficient synthesis of a wide range of methyl ketones from terminalalkynes is described. The reactions are conducted under convenient conditions and provide products with excellent regioselectivity in moderate to excellent yields, with broad substrate scope, including a variety of aromatic and aliphatic terminalalkynes.
The Iron(II) Complex [Fe(CF<sub>3</sub>SO<sub>3</sub>)<sub>2</sub>(mcp)] as a Convenient, Readily Available Catalyst for the Selective Oxidation of Methylenic Sites in Alkanes
The efficient and selective oxidation of secondary CH sites of alkanes is achieved by using low catalyst loadings of a non‐expensive, readily available iron catalyst [Fe(II)(CF3SO3)2(mcp)], Fe‐mcp, [mcp=N,N′‐dimethyl‐N,N′‐bis(2‐pyridylmethyl)cyclohexane‐trans‐1,2‐diamine]}, and hydrogen peroxide (H2O2) as oxidant, via a simple reaction protocol. Natural products are selectively oxidized and isolated
Cobalt-Catalyzed Oxidations in Volumetrically Expanded Liquids by Compressed Gases
申请人:Givens Richard S.
公开号:US20080139841A1
公开(公告)日:2008-06-12
Oxidations of hydrocarbons, cycloalkanes and alkenes, arylalkanes, and a variety of other organic substrates are accomplished by cobalt-N-hydroxysuccinimide co-catalyzed reactions with dioxygen under unusually mild, near ambient conditions of temperature and pressure. The improved safety of the oxidation method and the high yields of product obtained make use of a unique combination of cobalt (II) complexes with N-hydroxysuccinimide. These autoxidation reactions do not have prolonged initiation times. Many of these reactions can be safely performed under normal chemical laboratory conditions and do not require specialized equipment or reagents.
Herein developed mercuric triflate-TMU catalyzed hydration of terminalalkyne is a mild procedure to give methyl ketone in excellent yield with high chemoselectivity. By using 0.05 eq of Hg(OTf)2·(TMU)2 and 3 eq of water, hydration takes place at a reasonable rate in acetonitrile.
The specification describes and claims methods of controlling acarine pests by application of a compound of Formula (I), methods of controlling arthropod pests by application of a compound of Formula (IA), compounds of Formula (IA) per se, pesticidal compositions comprising a compound of Formula (IA), and processes for preparing a compound of Formula (IA).