398-36-7Relevant articles and documents
Synthesis, structures and catalytic activity of cyclometalated rhenium complexes
Sun, Ruichen,Wang, Tian,Zhang, Shaowei,Chu, Xiaodan,Zhu, Bolin
, p. 17063 - 17070 (2017)
Thermal reactions of aryl-substituted phosphines or phosphinites with Re2(CO)10 in chlorobenzene resulted in the corresponding five-membered cyclometalated rhenium complexes (1-5) via an intramolecular activation of the C(sp2)-H or C(sp3)-H bond. The only exception occurred in the case of (1-naphthyl)diisopropylphosphinite, which gave a diphosphinite-substituted dinuclear rhenium complex 6. Competition reaction indicated that the aromatic C(sp2)-H bond is more likely to be activated than the C(sp3)-H bond under the same conditions. Photolysis of 1 or 2 in CHX3 led to the cleavage of the Re-C σ bond to yield corresponding phosphine-substituted tetracarbonyl rhenium halides 7-10. Complex 1 reacted with CF3COOH in CH2Cl2 to give addition product 11. Photolysis of cyclorhenated complexes 1-3 with a series of aryl halides in benzene resulted in the stoichiometric formation of biphenyl, together with corresponding phosphine-substituted tetracarbonyl rhenium halides (7, 9, 10, 12, and 13). When base was introduced into the above reaction, a catalytic system was established. Under optimized conditions, complex 1 provided moderate yield of biphenyl in a couple of hours at a [Re] : substrate ratio of 1 : 200. Molecular structures of complexes 1, 6, 9, and 11 were determined by X-ray diffraction.
Cobalt-catalyzed cross-coupling reactions of aryl- And alkylaluminum derivatives with (hetero)aryl and alkyl bromides
Dilauro, Giuseppe,Messa, Francesco,Bona, Fabio,Perrone, Serena,Salomone, Antonio
supporting information, p. 10564 - 10567 (2021/10/19)
A simple cobalt complex, such as Co(phen)Cl2, turned out to be a highly efficient and cheap precatalyst for a host of cross-coupling reactions involving aromatic and aliphatic organoaluminum reagents with aryl, heteroaryl and alkyl bromides. New C(sp2)-C(sp2) and C(sp2)-C(sp3) bonds were formed in good to excellent yields and with high chemoselectivity, under mild reaction conditions.
Transition-Metal-Free Oxidative Cross-Coupling of Tetraarylborates to Biaryls Using Organic Oxidants
Gerleve, Carolin,Studer, Armido
, p. 15468 - 15473 (2020/05/06)
Readily prepared tetraarylborates undergo selective (cross)-coupling through oxidation with Bobbitt's salt to give symmetric and unsymmetric biaryls. The organic oxoammonium salt can be used either as a stoichiometric oxidant or as a catalyst in combination with in situ generated NO2 and molecular oxygen as the terminal oxidant. For selected cases, oxidative coupling is also possible with NO2/O2 without any additional nitroxide-based cocatalyst. Transition-metal-free catalytic oxidative ligand cross-coupling of tetraarylborates is unprecedented and the introduced method provides access to various biaryl and heterobiaryl systems.
