CuII-mediated controllable creation of tertiary and quaternary carbon centers: Designed assembly and structures of a new class of copper complexes supported by in situ generated substituted 1-pyridineimidazo[1,5-a] pyridine ligands
Chen Y.,Soochow University of China |
Li L.,Soochow University of China |
Cao Y.,Soochow University of China |
Wu J.,Soochow University of China |
And 7 more authors.
CrystEngComm | Year: 2013
Hydrothermal reaction of CuCl2·2H2O, 3-(pyridin-2-yl)imidazo[1,5-a]pyridine (HPIP) and formaldehyde, yielded a novel mixed-valence CuI/CuII complex [L1Cu2Cl 2][Cu2Cl4]·2EtOH (1·2EtOH; L1 = tetrakis(3-(pyridin-2-yl)imidazo[1,5-a]pyridin-1-yl)methane). The in situ generated quaternary carbon-containing ligand L1 was derived from Cu II-mediated quadruple coupling of HPIP and formaldehyde, where the three bonds of formaldehyde were totally cleaved. 1·2EtOH can also be prepared by replacing formaldehyde by formic acid, N,N-dimethylformamide, and glyoxal, respectively. When acetic acid, which usually serves as a radical reaction inhibitor, was introduced into the reaction systems, two CuI complexes [(L2)2Cu3](CuCl2) 3·2EtOH (2·2EtOH) and L3Cu2Cl2 (3) (L2 = tris(3-(pyridin-2-yl)imidazo[1,5-a]pyridin-1-yl)methane, and L3 = 1,1,2,2-tetrakis(3-(pyridin-2-yl)imidazo[1,5-a]pyridin-1-yl)ethane) were afforded. The tertiary carbon-bearing ligands L2 and L3 were generated in situ via CuII-mediated controllable cleavage of two bonds of formaldehyde, N,N-dimethylformamide and glyoxal, respectively. The plausible mechanisms for the formation of the ligands L1-L3 were proposed. © 2013 The Royal Society of Chemistry.
Geng B.,Jiangsu Suhua Group Co. |
Zhu X.-W.,Jiangsu Suhua Group Co. |
Ding X.-B.,Jiangsu Suhua Group Co. |
Wu Z.-F.,Jiangsu Suhua Group Co. |
Mu J.,Jiangsu Suhua Group Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2013
The new process for production of hexaphenoxycyclotriphosphazene (HPCTP) is studied using hexachlorocyclotriphosphazene and phenol as raw materials, which is also proved on industrial facilities. The result shows that high purity raw material is better for product quality control and higher yield. The obtained product is applied in CCL for flame retardant test and the material performance can meet the requirement of standards.