Pei, Lixia published the artcileHomo- and copolymerizations of ethylene and norbornene using bis(尾-ketoamino) titanium catalysts containing pyrazolone rings, Related Products of pyrazoles-derivatives, the publication is Polymers (Basel, Switzerland) (2017), 9(7), 262/1-262/12, database is CAplus and MEDLINE.
A series of bis(尾-ketoamino) titanium complexes containing pyrazolone rings (1-3) have been synthesized, characterized, and used as precursors for homo- and copolymerization of ethylene and norbornene. The titanium complexes activated with methylaluminoxane (MAO) exhibited good activities for homopolymerization of ethylene (E) to produce linear polyethylenes (PEs). Ethylene-norbornene copolymers (E-N) were also prepared by these catalysts with moderate activities, and influences of ligand substituents and norbornene addition on copolymer microstructure were studied in detail. Microstructure anal. of the E-N copolymers by 13C NMR and differential scanning calorimetry (DSC) techniques showed that alternating (ENEN) and isolated (ENEE) norbornene predominately appeared in the copolymer chain, and the NN dyad and NNN triad sequences were also present in the copolymers obtained by the less bulky catalyst 1.
Polymers (Basel, Switzerland) published new progress about 4551-69-3. 4551-69-3 belongs to pyrazoles-derivatives, auxiliary class Benzenes, name is 4-Benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, and the molecular formula is C17H14N2O2, Related Products of pyrazoles-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics