709643-15-2Relevant academic research and scientific papers
A hemilabile diphosphine pyridine pincer ligand: σ- and π-binding in molybdenum coordination complexes
Agapie, Theodor,Buss, Joshua A.,Horak, Kyle T.,Wan, Ruomeng
, (2020)
A series of molybdenum compounds supported by a hemilabile pyridine diphosphine pincer ligand have been synthesized. The ligand demonstrates variable binding modes, adapting to the electronic and geometric requirements of the metal center. In Mo0 and MoII polycarbonyl complexes, coordination through the σ-donating pyridine nitrogen lone pair is observed. Upon oxidative group transfer with anionic azide, a MoIV nitride compound is formed, accompanied by a change in the ancillary ligand binding mode to the pyridine π-system. The σ-coordination was restored by subsequent functionalization of the nitride moiety with either silyl electrophiles or protons. Protonation results in redox disproportionation with concomitant nitride functionalization. Characterization by single crystal X-ray diffraction, nuclear magnetic resonance, and infrared spectroscopy is discussed.
Biaryl Group 4 Metal Complexes as Non-Metallocene Catalysts for Polyethylene with Long Chain Branching
Gragert, Maria M.,Tomov, Atanas K.,Bettonville, Serge,Pannier, Ga?lle,White, Andrew J. P.,Britovsek, George J. P.
, p. 4088 - 4092 (2020/11/23)
A series of biaryl Group 4 complexes with a bidentate and a tridentate pincer ligand have been synthesized and characterized. The complexes have been applied as metallocene analogues for the controlled polymerization of ethylene and the copolymerization of ethylene and 1-hexene, with a particular focus on the control of the degree of long chain branching in these polymers.
Pd-Catalyzed Decarboxylation and Dual C(sp3)-H Functionalization Protocols for the Synthesis of 2,4-Diarylpyridines
Gujjarappa, Raghuram,Vodnala, Nagaraju,Kumar, Mohan,Malakar, Chandi C.
, p. 5005 - 5020 (2019/04/25)
The Pd-catalyzed decarboxylation and dual C(sp3)-H bond functionalization approaches have been described for the preparation of symmetrical and unsymmetrical 2,4-diarylpyridines. The developed transformations were realized using nonactivated aromatic ketones and amino acids as C-N sources. The efficacy of the catalyst and reagent combination drives the transformation toward the formation of desired products with high yields and selectivity. The described reaction conditions have seduced the self-reaction of phenylalanine via [2 + 2 + 2] cycloaddition and minimized the formation of 3,5-phenylpyridine as a side product, whereas using glycine as a C-N source, the corresponding 2,6-diarylpyridines were formed as minor products.
Self-assembly of a highly stable, topologically interesting metallamacrocycle by bridging gold(I) ions with pyridyl-2,6-diphenyl 2- and diphosphanes
Kui, Steven C. F.,Huang, Jie-Sheng,Sun, Raymond Wai-Yin,Zhu, Nianyong,Che, Chi-Ming
, p. 4663 - 4666 (2007/10/03)
(Figure Presented) A Moebius arrangement of the bonds directly attached to a metallamacrocycle was observed for the AuI complex [Au 3(CNC)(μ-Ph2PCH2PPh2) 2]+, which was self-assembled by treating the lithium salt of pyridyl-2,6-diphenyl2- (CNC) with [Au2Cl 2(μ-Ph2PCH2PPh2)]. The trinuclear AuI complex has intramolecular Au...Au and C-C...π interactions, exhibits a remarkable stability in solution, and is cytotoxic toward cancer cell lines.
