Preparation of a palladium dimer with a cobalt-containing bulky phosphine ligand: Its application in palladium catalyzed Suzuki reactions

Iron carbonyl complex containing bis[2‐(diphenylphosphino)phenyl]ether enhancing efficiency in the palladium‐catalyzed Suzuki–Miyaura reaction

“…Among different metal-containing phosphines, ferrocenyl phosphines are one of the most extensively studied phosphines used as ligands in palladium-catalyzed cross-coupling reactions, including Suzuki-Miyaura reactions. [27][28][29][50][51][52][53] Besides ferrocenyl phosphines, cobalt-carbonyl-phosphines [31,[54][55][56] and rheniumcarbonyl-phosphine [57] are the only other metal-containing phosphines used as ligands in the Suzuki-Miyaura. Since, complex 1 is sufficiently bulky and has an uncoordinated phosphine arm, we were intrigued to see whether this free arm of complex 1 could be exploited as a ligand in the palladium-catalyzed wileyonlinelibrary.com/journal/aoc Suzuki-Miyaura reaction.…”

Amination and Suzuki coupling reactions catalyzed by palladium complexes coordinated by cobalt-containing monodentate phosphine ligands with bis-trifluoromethyl substituents on bridged arylethynyl: Observation of some unusual metal-containing compounds

“…An unusual palladium complex {[(lPPh 2 CH 2 PPh 2 )Co 2 (CO) 4 ][(l,g-( t Bu) 2 PC"C(p-R-C 6 H 3 )-jC 1 )]Pd(lOAc)} (5a: R = H) was prepared from the reaction of the cobaltcontaining bulky phosphine 4a with Pd(OAc) 2 . As disclosed by its crystal structure, during the formation of 5a a process of orthometallation occurred accompanied by the release of one equivalent of acetic acid [28][29][30]. The acetate chelates to the palladium metal in a g 2 -mode.…”

“…It was proposed that in SuzukiMiyaura reaction the reduction might be proceeded via the attack of borate, PhBðOHÞ À 3 , on the palladium center in basic medium [31]. Our previous works had demonstrated that the Suzuki-Miyaura cross-coupling reaction of aryl halide and organoboronic acid could be carried out catalytically either by in vitro 4/Pd(OAc) 2 or by isolated and purified 5 [29]. In addition, the latter had also been employed in the amination reactions of substituted bromobenzenes and morpholine.…”