38946-25-7Relevant articles and documents
Titanium complexes bearing amine bis(phenolate) ligands: Synthesis, structure and catalysis in ring-opening polymerization of lactide
Wang, Baolong,Zhang, Jianing,Zhao, Huanqin,Huang, He,Zheng, Junpei,Wang, Liying,Sun, Junmin,Zhang, Yongfeng,Cao, Zhenzhu
, (2017)
Monomeric bis(isopropoxy) titanium complexes LTi(OiPr)2 (L?=?─OC6H2–4-R1–6-R2–2-CH2N[(CH2)2N(R3)2]CH2–4-R4–6-R5-C6H2O─, R1?=?R2?=?tBu, R3?=?Et, R4?=?R5?=?Cl, (L1)Ti(OiPr)2; R1?=?R2?=?Me, R3?=?Et, R4?=?R5?=?Me, (L2)Ti(OiPr)2; R1?=?R2?=?tBu, R3?=?Et, R4?=?OMe, R5?=?tBu, (L3)Ti(OiPr)2; R1?=?R4?=?OMe, R3?=?Et, R2?=?R5?=?tBu, (L4)Ti(OiPr)2; R1?=?R2?=?tBu, R3?=?Me, R4?=?OMe, R5?=?tBu, (L5)Ti(OiPr)2) supported by amine bis(phenolate) ligands were synthesized and characterized using NMR spectroscopy and elemental analysis. The solid-state structure of (L3)Ti(OiPr)2 was determined using single-crystal X-ray diffraction. (L1 –5)Ti(OiPr)2 were all found to initiate the ring-opening polymerization of l-lactide and rac-lactide in a controlled manner at 110–160°C. As shown by kinetic studies, (L1)Ti(OiPr)2 polymerized l-lactide faster than did (L2 –5)Ti(OiPr)2. In addition, good number-average molecular weight and narrow polydispersity index (1.00–1.71) of polymers were also obtained. The microstructure of the polymers and a possible mechanism of coordination–insertion of polymerization were evidenced by MALDI-TOF and 1H NMR spectra of the polylactides.
Synthesis method of dimethyl ethylenediamine tert-butylphenol
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Paragraph 0016-0018, (2020/12/08)
The invention discloses a synthesis method of dimethyl ethylenediamine tert-butylphenol. The synthesis method comprises the steps of: (1) dissolving 3,5-di-tert-butylsalicylaldehyde into anhydrous ethanol, carrying out filtering and dropwise adding a glac
Solvent dependent disproportionation of Cu(II) complexes of N2O2-type ligands: Direct evidence of formation of phenoxyl radical: An experimental and computational study
Debnath, Rajib Kumar,Kalita, Apurba,Sinha, Sourab,Bhattacharyya, Pradip Kr.,Mondal, Biplab,Ganguli, Jatindra Nath
, p. 4490 - 4500 (2015/11/27)
Four Cu(II) complexes (1, 2, 3 and 4) with N2O2-type ligand, H2L1, H2L2, H2L3 and H2L4, respectively have been synthesized as the functional model for galactose oxidase. In presence of acetonitrile the Cu(II) centres in the complexes, undergo reduction with simultaneous oxidation of the ligands. The ligand oxidized products are isolated and characterized. Spectroscopic studies indicate that this disproportionation goes through the formation of a Cu(II)-phenoxyl intermediate. The complexes also undergoes the same reaction with pyridine, which indicates the involvement of the exergonic N-donor ligand for the formation of Cu(II)-phenoxyl complex. The Cu(II)-phenoxyl complexes are found to be stable in methanol in presence of a strong base. The paramagnetic centers in the Cu(II)-phenoxyl complexes were found to be weakly ferromagnetically coupled. The complexes, in acetonitrile solvent, have been found to oxidize primary alcohols to corresponding aldehydes. In absence of single crystal structures of the complexes, we optimized the structures using density functional theory (DFT). The UV-visible peaks of complexes as found from time dependent density functional theory (TDDFT) calculations match well with the observed experimental results.
