A mild, phosphine-free method for the conversion of alcohols into halides (Cl, Br, I) via the corresponding O-alkyl isoureas
作者:Zhengning Li、Stefano Crosignani、Bruno Linclau
DOI:10.1016/j.tetlet.2003.09.024
日期:2003.10
A novel procedure for the conversion of primary and secondary alcohols into the corresponding alkyl chlorides, bromides and iodides is described. The transformation is high-yielding in the case of chlorides and bromides, tolerates a range of functional groups, and does not rely on the use of phosphines.
This invention relates to the direct grafting of a calixarene mostly onto the surface of a material, as well as to a grafting process, and certain calixarene intermediates useful for carrying the grafting process.
Organocatalytic Chlorination of Alcohols by P(III)/P(V) Redox Cycling
作者:Lars Longwitz、Stefan Jopp、Thomas Werner
DOI:10.1021/acs.joc.9b00741
日期:2019.6.21
system for the chlorination of alcohols under Appel conditions was developed. Benzotrichloride is used as a cheap and readily available chlorinating agent in combination with trioctylphosphane as the catalyst and phenylsilane as the terminal reductant. The reaction has several advantages over other variants of the Appel reaction, e.g., no additional solvent is required and the phosphane reagent is used
New aliphatically substituted aryl-chalcogeno-hydrocarbon derivatives
申请人:Ciba-Geigy Corporation
公开号:US03933835A1
公开(公告)日:1976-01-20
Compounds of the formula I R.sub.1 -- Ph -- X -- alk -- R.sub.2 (I) wherein R.sub.1 is adamantyl, Ph is phenylene which is optionally substituted by amino, nitro, lower alkyl, lower alkoxy, halogen or trifluoromethyl, X is oxy or thio, alk is alkylene with 1 to 20 C atoms or alkenylene with 2 to 20 C atoms and R.sub.2 is free, esterfied or amidised carboxyl, sulpho or sulphonamido and therapeutically acceptable salts thereof are useful as anti-allergic and hypolipidaemic agents.