1440415-36-0Relevant academic research and scientific papers
Magnesium and zinc complexes containing pendant pyrazolyl-phenolate ligands as catalysts for ring opening polymerisation of cyclic esters
Chen, Chi-Tien,Hung, Chia-Chi,Chang, Yu-Jen,Peng, Kuo-Fu,Chen, Ming-Tsz
, p. 1 - 9 (2013)
Reactions of HOPhtBu(CH2)Pz {4,6-di-tert-butyl-2- (pyrazol-1-yl-methyl)phenol} or HOPhtBu(CH2)Pz Me {4,6-di-tert-butyl-2-(3,5-dimethylpyrazol-1-yl-methyl)phenol} with 1.1 equivalent of MgnBu2 in toluene gave the binuclear compounds (nBuMgOPhtBu(CH2)Pz)2 (1) or (nBuMgOPhtBu(CH2)PzMe) 2 (2). Treatment of HOPhtBu(CH2)Pz or HOPh tBu(CH2)PzMe with 1.1 equivalent of ZnEt 2 in n-hexane yielded binuclear compounds (EtZnOPh tBu(CH2)Pz)2 (3) and (EtZnOPh tBu(CH2)PzMe)2 (4). Colourless crystals of (ClZnOPhtBu(CH2)Pz)2 (5) were obtained via the recrystallisation of 3 from a concentrated dichloromethane solution at room temperature. Alternative route for the synthesis of 5 can be achieved via the reaction of HOPhtBu(CH2)Pz with 1.1 equivalent of n-butyllithium in diethylether followed by the treatment of 1.1 equivalent of ZnCl2 in tetrahydrofuran gave compound 5 as binuclear chloride complex. The compounds 2 and 5 were crystallographically characterised. The catalytic activities of 1-5 towards the ring opening polymerisation reactions of cyclic esters in the presence of benzyl alcohol were under investigation.
