An article Isoprene Polymerization with Pyrazolylimine Cobalt(II) Complexes: Manipulation of 3,4-Selectivities by Ligand Design and Use of Triphenylphosphine WOS:000458272500008 published article about 1,3-BUTADIENE POLYMERIZATION; BUTADIENE POLYMERIZATION; LIVING POLYMERIZATION; CATALYTIC-PROPERTIES; CONJUGATED DIENES; METAL; BEARING; 3,4-POLYMERIZATION; REACTIVITY; BEHAVIOR in [Fang, Liang; Zhao, Wenpeng; Liu, Heng; Hu, Yanming; Zhang, Xuequan] Chinese Acad Sci, Changchun Inst Appl Chem, CAS Key Lab High Performance Synthet Rubber & Its, 5625 Renmin St, Changchun 130022, Jilin, Peoples R China; [Zhao, Wenpeng] Univ Chinese Acad Sci, Beijing 100039, Peoples R China; [Han, Chao] Shenyang Univ Chem Technol, Sch Mat Sci & Engn, Shenyang, Liaoning, Peoples R China in 2019.0, Cited 60.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. Safety of 3,5-Dimethyl-1H-pyrazole
A series of pyrazolylimine CoCl2 complexes were synthesized and well characterized. The single crystal structures and coordination geometries of these complexes were confirmed by X-ray diffraction, which revealed dimeric and monomeric structures, and thereby distorted trigonal bipyramidal and distorted tetrahedral geometries, respectively. In combination with diethylaluminum chloride (DEAC) and methylaluminoxane (MAO) as cocatalysts, the present cobalt complexes displayed high activity toward isoprene polymerization, affording cis-1,4/3,4-polyisoprenes. Polymerization parameters have significant influence on the polymerization behavior. Additionally, incorporation of the external donor triphenylphosphine led to a switch in selectivity of the system from cis-1,4 to 3,4, providing an effective method to adjust the 3,4-moieties on a large scale.
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Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics