1372762-89-4Relevant academic research and scientific papers
Epoxidation of cyclohexene with O2 over the composite catalysts of Mn-montmorillonite coordinated with novel Schiff-base ligands
Peng,Li, Zhongying,Tang, Ruiren
, p. 19965 - 19970 (2013)
The catalytic activity of the heterogeneous catalysts of Mn-mont (where mont represents montmorillonite) coordinated with Schiff-base ligands for epoxidation of cyclohexene by O2 under Mukaiyama conditions was studied. The catalysts were characterized by IR, UV-vis DRS, XRD, SEM and ICP. The heterogeneous catalysts were proved to promote the epoxidation of cyclohexene efficiently, the effects of various reaction conditions on the catalytic reaction were optimized and obtained as high as 100% conversion with 90.0% selectivity of epoxycyclohexane at 40 °C in 5 h with molecular oxygen as oxidant in acetonitrile. Repeated runs indicated that the catalysts were stable for at least 3 cycles. Thus, the heterogeneous catalysts of Mn-mont coordinated with Schiff-base ligands were proved to be environmentally friendly and economical for the epoxidation of cyclohexene. The Royal Society of Chemistry 2013.
Copolymerization of ethylene with acrylonitrile promoted by novel nonmetallocene catalysts with phenoxy-imine ligands
Zhang, Xinli,Liu, Zhi,Yi, Jianjun,Li, Fengjiao,Huang, Haibing,Liu, Wei,Zhen, Hongpeng,Huang, Qigu,Gao, Kejing,Yang, Wantai
, p. 2068 - 2074 (2012)
A series of novel nonmetallocene catalysts with phenoxy-imine ligands was synthesized by the treatment of phthaldialdehyde, substituted phenol with TiCl4, ZrCl4, and YCl3 in THF. The structures and properties of the catalysts were characterized by 1H NMR and elemental analysis. These catalysts were used for copolymerization of ethylene with acrylonitrile after activated by methylaluminoxane (MAO). The effects of copolymerization temperature, Al/M (M = Ti, Zr, and Y) ratio in mole, concentrations of catalyst and comonomer on the polymerization behaviors were investigated in detail. These results revealed that these catalysts were favorable for copolymerization of ethylene with acrylonitrile. Cat.3 was the most favorable one for the copolymerization of ethylene with acrylonitrile, and the catalytic activity was up to 2.19 × 104 g PE/mol.Ti.h under the conditions: polymerization temperature of 50 °C, Al/Ti molar ratio of 300, catalyst concentration of 1.0 × 10-4 mol/L, and toluene as solvent. The resultant polymer was characterized by FTIR, cross-polarization magic angle spinning, 13C NMR, WAXD, GPC, and DSC. The results confirmed that the obtained copolymer featured high-weight-average molecular weight, narrow molecular weight distribution about 1.61-1.95, and high-acrylonitrile incorporation up to 2.29 mol %. Melting temperature of the copolymer depended on the content of acrylonitrile incorporation within the copolymer chain.
