Iron catalyzed cross coupling reactions of aromatic compounds
申请人:——
公开号:US20030220498A1
公开(公告)日:2003-11-27
A process for the production of compounds Ar—R
1
by means of a cross-coupling reaction of an organometallic reagent R
1
—M with an aromatic or heteroaromatic substrate Ar—X catalyzed by one or several iron salts or iron complexes as catalysts or pre-catalysts, present homogeneously or heterogeneously in the reaction mixture. This new invention exhibits substantial advantages over established cross coupling methodology using palladium- or nickel complexes as the catalysts. Most notable aspects are the fact that (i) expensive and/or toxic nobel metal catalysts are replaced by cheap, stable, commercially available and toxicologically benign iron salts or iron complexes as the catalysts or pre-catalysts, (ii) commercially attractive aryl chlorides as well as various aryl sulfonates can be used as starting materials, (iii) the reaction can be performed under “ligand-free” conditons, and (iv) the reaction times are usually very short.
and -CF(3) groups are compatible. The method also allows for consecutive cross-coupling processes in one pot, as exemplified by the efficient preparation of compound 12, and has been applied to the first synthesis of the cytotoxic marine natural product montipyridine 8. In contrast to the clean reaction of (hetero)aryl chlorides, the corresponding bromides and iodides are prone to a reduction of their
Identification of organophosphorus simulants for the development of next-generation detection technologies
作者:Rebecca J. Ellaby、Ewan R. Clark、Nyasha Allen、Faith R. Taylor、Kendrick K. L. Ng、Milan Dimitrovski、Dominique F. Chu、Daniel P. Mulvihill、Jennifer R. Hiscock
DOI:10.1039/d0ob02523b
日期:——
Organophosphorus (OP) chemicalwarfare agents (CWAs) represent an ongoing threat but the understandable widespread prohibition of their use places limitations on the development of technologies to counter the effects of any OP CWA release. Herein, we describe new, accessible methods for the identification of appropriate molecular simulants to mimic the hydrogen bond accepting capacity of the PO moiety
FUNCTIONALIZED MAGNETIC NANOPARTICLE, A CATALYST, A METHOD FOR FORMING C-C BONDS
申请人:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
公开号:US20180099987A1
公开(公告)日:2018-04-12
A functionalized magnetic nanoparticle including an organometallic sandwich compound and a magnetic metal oxide. The functionalized magnetic nanoparticle may be reacted with a metal precursor to form a catalyst for various C—C bond forming reactions. The catalyst may be recovered with ease by attracting the catalyst with a magnet.
Cyclic ureas (DMI, DMPU) as efficient, sustainable ligands in iron-catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) coupling of aryl chlorides and tosylates
作者:Elwira Bisz、Michal Szostak
DOI:10.1039/c7gc02690k
日期:——
Iron-catalyzed cross-coupling has emerged as a powerful tool for sustainable catalysis. However, by far the most common ligand in iron-catalyzed cross-couplings for preparative and industrial applications is reprotoxic NMP. Herein, we report that cyclic ureas (DMI, DMPU) are efficient and sustainable alternatives to NMP in iron-catalyzedalkylations of aryl chlorides and tosylates with alkyl Grignard