Zhu, Luqun published the artcileA trinuclear [Zn3(L)2(OAc)2] complex based on the asymmetrical bis-Schiff-base ligand H2L for ring-opening copolymerization of CHO and MA, Application of 4-Benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, the publication is Inorganic Chemistry Communications (2013), 182-185, database is CAplus.
Based on asym. bis-Schiff-base ligand H2L from o-vanillin and the half-unit Schiff-base precursor HL synthesized from 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) and o-phenylenediamine, a trinuclear [Zn3(L)2(OAc)2] (1) is obtained. In complex 1, the unsaturated five and four-coordinate coordination environment for the catalytic active centers (Zn2+ ions) permits the monomer insertion for the effective bulk or solution copolymerization of CHO (cyclohexene oxide) and MA (maleic anhydride) in the presence of co-catalyst of DMAP (4-(dimethylamino)pyridine), TPP (triphenylphosphine) or n-Bu4NBr. All the bulk copolymerizations afford poly(ester-co-ether)s, while some of the solution copolymerizations produce perfectly alternating polyester copolymers. Of the three co-catalysts, DMAP is found to be the most efficient, while an excess thereof is detrimental for chain growth of the copolymers.
Inorganic Chemistry Communications 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 C12H16N2O2, Application of 4-Benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics