854824-51-4Relevant academic research and scientific papers
Iron-Catalyzed Hydroboration: Unlocking Reactivity through Ligand Modulation
Espinal-Viguri, Maialen,Woof, Callum R.,Webster, Ruth L.
, p. 11605 - 11608 (2016)
Iron-catalyzed hydroboration (HB) of alkenes and alkynes is reported. A simple change in ligand structure leads to an extensive change in catalyst activity. Reactions proceed efficiently over a wide range of challenging substrates including activated, unactivated and sterically encumbered motifs. Conditions are mild and do not require the use of reducing agents or other additives. Large excesses of borating reagent are not required, allowing control of chemo- and regioselectivity in the presence of multiple double bonds. Mechanistic insight reveals that the reaction is likely to proceed via a highly reactive iron hydride intermediate.
An unsymmetrical iron(II) bis(imino)pyridyl catalyst for ethylene polymerization: Effect of a bulky ortho substituent on the thermostability and molecular weight of polyethylene
Guo, Li-Hua,Gao, Hai-Yang,Zhang, Ling,Zhu, Fang-Ming,Wu, Qing
experimental part, p. 2118 - 2125 (2010/06/18)
Three new iron(II) 2,6-bis(imino)pyridyl complexes bearing bulky and unsymmetrical substituted aniline groups, [2-(CH(CH3)(C 6H5))-4-R1-6-R2-C6H 2N - C(CH3)]2C5H 3NFeCl2 (1, R1 = H, R2 = methyl; 2, R1 = methyl, R2 = methyl; 3, R1 = H, R 2 = methoxy), were synthesized. The unsymmetrical bis(imino)pyridyl ligand L2 contains three isomers that can be detected by 1H NMR and 13C NMR spectroscopy. However, the corresponding complex 2 exhibits only one isomer in solution. X-ray diffraction of 2 confirms that the iron complex adopts a Cs configuration. These complexes activated by methylaluminoxane (MAO) have high catalytic activities for ethylene polymerization and produce linear polyethylenes with bimodal or broad molecular weight distribution. The steric and electronic effects of the ortho substituents on the aniline moiety distinctly affect the molecular weight of the obtained polyethylene. In comparison with 1 and 3, having a single ortho substituent on the aryl rings, and the typical complex 4, containing o-diisopropyl substitution, complex 2 has better thermal stability and produces much higher molecular weight polyethylene. Even at 70 °C, the 2/MAO system still keeps high activity and relatively stable kinetics.
