157635-96-6Relevant academic research and scientific papers
Bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups: Crystal structure and their catalytic properties toward (co)polymerization of norbornene and 1-hexene
He, Xiaohui,Tu, Guangshui,Zhang, Feng,Huang, Shengmei,Cheng, Changwen,Zhu, Chuanyi,Duan, Yapeng,Wang, Suli,Chen, Defu
, p. 36298 - 36312 (2018)
Eight bis-(salicylaldehyde-benzhydrylimino)nickel complexes with different electron groups (Ni1-Ni8), Ni{(3-R1)(5-R2)C6H2(O)CHNCH(C6H5)2}2, (R1 = H, R2 = H, Ni1; R1 = H, R2 = CH3, Ni2; R1 = H, R2 = OCH3, Ni3; R1 = H, R2 = Br, Ni4; R1 = CH3, R2 = H, Ni5; R1 = OCH3, R2 = H, Ni6; R1 = Br, R2 = Br, Ni7; R1 = Cl, R2 = Cl, Ni8), were synthesized and their crystal structures were characterized using single crystal X-ray diffraction. The results revealed that Ni1-Ni6 belong to the monoclinic system (space group P2(1)/n), Ni7 belongs to the monoclinic system (space group C2/c) and Ni8 belongs to the triclinic system (space group P1). All nickel complexes exhibited high activities (0.46-2.07 × 106 gpolymer molNi-1 h-1) toward norbornene homopolymerization, and a strong electron-withdrawing group on the salicylaldimino aromatic ring can enhance the catalytic activity and favor polymerization. Ni1 and Ni2 exhibited high activities (0.55-2.40 × 105 gpolymer molNi-1 h-1) toward copolymerization of norbornene and 1-hexene in the presence of B(C6F5)3. The 1-hexene content in the copolymers could be controlled up to 7.98-12.50% by varying the comonomer feed ratio of 1-hexene from 10 to 50%. It is observed that when the 5-position of the salicylaldimino aromatic ring has a substituent (-CH3), the 1-hexene insertion rate is lower than that without a substituent. In addition, the polymers showed high molecular weights (1.5-2.4 × 105 g mol-1) and narrow molecular weight distributions (1.62-1.89). The obtained polymers were also verified to be amorphous copolymers and had high thermal stability, good solubility and optical transparency.
Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation
Daneshmand, Pargol,Pinon, Leena,Schaper, Frank
, p. 10147 - 10161 (2018/08/09)
Dinuclear bis(R′-(R′′-iminomethyl)phenoxide) copper complexes L2Cu2(μ-OR)2 were prepared from the reaction of copper methoxide with ROH and LH (ROH = dimethylaminoethanol or pyridylmethanol, R′ = H, 4,6-tBu, 1,3-Cl, R′′ = benzyl, cyclohexyl, diphenylmethyl and 2,6-dimethylphenyl). Preparation was complicated by formation of homoleptic L2Cu and only 9 of the 24 possible combinations could be prepared. All complexes were characterized by single crystal X-ray diffraction studies and crystallized as dinuclear penta-coordinated complexes. Homoleptic complexes L2Cu were inactive in lactide polymerization at room temperature. Most heteroleptic complexes showed modest to good activities with full conversion in less than 6 h at room temperature. Complexes with R′ = H showed poor molecular weight control, complexes with R′ = Cl were inactive in polymerization. In pyridylmethoxide-containing complexes, only one alkoxide initiated chain growth. All complexes produced atactic polymer.
Evaluation of N-(2-thienylidene)amines, N-(2-hydroxybenzylidene)amines and 3-iminoindolin-2-ones as antileishmanial agents
Al-Kahraman, Yasser M.S.A.,Singh, Girija S.,Yasinzai, Masoom
experimental part, p. 491 - 495 (2012/06/18)
The paper describes the synthesis and antileishmanial activity of N-substituted imines, obtained from the reactions of primary amines with three biologically important aldehydes/ketones, thiophene-2-carbaldehyde, 2- hydroxybenzaldehyde (salicylaldehyde) and indoline-2,3-dione. Of the fourteen compounds screened from three classes, five compounds showed significant antileishmanial activity. Among the three classes of imines, the class of N-(2- thienylidene)amines showed much better activity than the other two classes. N-(2-Thienylidene)benzhydrylamine showed IC50 value of 0.51 μg/ml. The effect of substituents on the bioactivity is discussed.
