Synthesis of a New Polydentate Ligand Obtained by Coupling 2,6-Bis(imino)pyridine and (Imino)pyridine Moieties and Its Use in Ethylene Oligomerization in Conjunction with Iron(II) and Cobalt(II) Bis-halides was written by Bianchini, Claudio;Giambastiani, Giuliano;Guerrero Rios, Itzel;Meli, Andrea;Oberhauser, Werner;Sorace, Lorenzo;Toti, Alessandro. And the article was included in Organometallics in 2007.Category: alcohols-buliding-blocks This article mentions the following:
In this paper are described the synthesis, characterization, and coordinating properties of a new potentially pentadentate nitrogen ligand, CyAr2N5 (I), that combines in the same mol. structure 2,6-bis(imino)pyridine and (imino)pyridine moieties. This ligand reacts with 1 or 2 equiv of anhydrous MCl2 (M = Fe, Co) to give paramagnetic mononuclear or homodinuclear complexes of the formula CyAr2N5MCl2 and CyAr2N5M2Cl4. In the dinuclear complexes, one metal center is five-coordinate, while the other is four-coordinate. Ligand and metal complexes were characterized, both in the solid state and in solution, by a variety of techniques, including single-crystal x-ray diffraction analyses, magnetic susceptibility determinations, IR, visible-NIR, 1H NMR, and X-band EPR spectroscopies. On activation by methylaluminoxane (MAO) in toluene, the FeII and CoII complexes generate effective catalysts for the oligomerization of ethylene to α-olefins with productivities and Schulz-Flory parameters depending on the type and number of the coordinated metals. In an attempt to rationalize the surprisingly high activity of the CoII precursors, and in particular that of the dinuclear derivative CyAr2N5Co2Cl4, which is 4 times higher than that of the mononuclear analog CyAr2N5CoCl2, a CoII complex was synthesized where the supporting ligand is sterically similar to CyAr2N5, yet it contains only the three nitrogen donor atoms of the 2,6-bis(imino)pyridine moiety. All five nitrogen atoms of CyAr2N5 play an active role under catalytic conditions, even when the precursor contains a free (imino)pyridine moiety. In the experiment, the researchers used many compounds, for example, 2-Bromo-6-(2-methyl-1,3-dioxolan-2-yl)pyridine (cas: 49669-14-9Category: alcohols-buliding-blocks).
2-Bromo-6-(2-methyl-1,3-dioxolan-2-yl)pyridine (cas: 49669-14-9) belongs to alcohols. Because alcohols are easily synthesized and easily transformed into other compounds, they serve as important intermediates in organic synthesis. Alcohols may be oxidized to give ketones, aldehydes, and carboxylic acids. These functional groups are useful for further reactions. Oxidation of organic compounds generally increases the number of bonds from carbon to oxygen (or another electronegative element, such as a halogen), and it may decrease the number of bonds to hydrogen.Category: alcohols-buliding-blocks
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts