Process of use in perfluoroalkyation and reactant for making use of this process
申请人:Rhodia Chimie
公开号:US06355849B1
公开(公告)日:2002-03-12
The subject-matter of the present invention is a process of use in perfluoroalkylation and a reactant for making use of this process. This process is defined in that it comprises a stage in which a material of formula RfH and a base (or a species capable of generating a base) are brought into contact, in a polar and anhydrous medium, with a substrate carrying at least one electrophilic functional group. Application to organic synthesis.
Addition of CFCl<sub>3</sub>to Aromatic Aldehydes under Ultrasonic Irradiation
作者:Sadao Tsuboi、Balaka Barkakaty、Yutaka Takaguchi
DOI:10.1055/s-2006-926367
日期:——
Reductive addition of CFCl3 to aromatic aldehydes under the influence of activated aluminum powder and ultrasonic irradiation produced chlorofluoro carbinols in reasonable to excellent yields.
在活性铝粉和超声波照射的影响下,CFCl3 与芳香醛的还原加成反应产生了氯氟甲醇,收率合理至优异。
Addition of CFCl3 to Aromatic Aldehydes via in Situ Grignard Reaction
cost-effective and an environmentally benign strategy for the safe consumption/destruction of the ozone depleting potential of the reagent. In this report, we present a novel method for in situ Grignardreaction using magnesium powder and CFCl3 for synthesis of dichlorofluoromethyl aromatic alcohols.
A new TEMPO-mediated catalytic oxidation method in combination with Py center dot HBr3 (stoichiometric) is developed for oxidation of secondary alcohols to the corresponding ketones. The performance of this oxidizing system is better compared with that of TEMPO method combined with R4NBr3 center dot Poly(4-vinylpyridine) HBr3 can be used in place of Py center dot HBr3. The electron-withdrawing substituent at the C-4 position of TEMPO increases the reactivity of TEMPO significantly in the oxidation of electron-deficient alcohols Such as polyhaloalkylmethanols. Inductive effect of the substituent of TEMPO is discussed through the characterization of the redox potential of N-O radical by cyclic voltammetry. (C) 2008 Elsevier Ltd. All rights reserved.
Direct electroreduction or use of an electrogenerated base : two ways for the coupling of polyhalogenated compounds with aldehydes or ketones.
The electrochemical coupling of polyhalogenated compounds with carbonyl compounds is achieved in two ways. A carbanion RX(n)(-) is generated either by the direct electroreduction of RX(n)Cl or by deprotonation of RX(n)H. In this latter case the base Ph(-) is electrogenerated by reduction of iodobenzene. All electrolysis were carried out in an undivided cell fitted with a cadmium-coated cathode and an aluminium or magnesium sacrificial anode. (C) 1997, Elsevier Science Ltd.