Copper Iminopyrrolidinates: A Study of Thermal and Surface Chemistry
摘要:
Several copper(I) iminopyrrolidinates have been evaluated by thermogravimetric analysis (TGA) and solution based H-1 NMR studies to determine their thermal stability and decomposition mechanisms. Iminopyrrolidinates were used as a ligand for copper(I) to block previously identified decomposition routes of carbodiimide deinsertion and beta-hydrogen abstraction. The compounds copper(I) isopropyl-iminopyrrolidinate (1) and copper(I) tert-butyl-iminopyrrolidinate (2) were synthesized for this study, and compared to the previously reported copper(I) tert-butyl-imino-2,2-dimethylpyrrolidinate (3) and the copper(I) guanidinate [Me2NC((PrN)-Pr-1)(2)Cu](2) (4). Compounds 1 and 2 were found to be volatile yet susceptible to decomposition during TGA. At 165 degrees C in C6D6, they had half-lives of 181.7 h and 23.7 h, respectively. The main thermolysis product of 1 and 2 was their respective protonated iminopyrrolidine ligand. beta-Hydrogen abstraction was proposed for the mechanism of thermal decomposition. Since compound 3 showed no thermolysis at 165 degrees C, it was further studied by chemisorption on high surface area silica. It was found to eliminate an isobutene upon chemisoption at 275 degrees C. Annealing the sample at 350 degrees C showed further evidence of the decomposition of the surface species, likely eliminating ethene, and producing a surface bound methylene diamine.
2H-PYRROL-5-AMINE DERIVATIVES AS ALPHA ADRENERGIC RECEPTOR MODULATORS
申请人:ALLERGAN, INC.
公开号:EP2486009B1
公开(公告)日:2019-08-21
KR2023/158682
申请人:——
公开号:——
公开(公告)日:——
Heteroleptic iminopyrrolidinates of aluminium
作者:Yamile A. Wasslen、Agnieszka Kurek、Paul A. Johnson、Taylor C. Pigeon、Wesley H. Monillas、Glenn P. A. Yap、Seán T. Barry
DOI:10.1039/c0dt00267d
日期:——
products with high yields. Crystal structures were collected for compounds7 [ipipAlMe2], 12 [tbipAlMe2], and 14 [sbipAlEt2] demonstrating that the heteroleptic aluminium species were dimers. This was also evident in the massspectra collected for each compound as the parent peak was that of the dimer minus a methyl. Thermolysis studies were carried out on all the ipAlMe2 species to observe the decomposition
Copper Iminopyrrolidinates: A Study of Thermal and Surface Chemistry
作者:Jason P. Coyle、Peter J. Pallister、Agnieszka Kurek、Eric R. Sirianni、Glenn P. A. Yap、Seán T. Barry
DOI:10.1021/ic3021035
日期:2013.1.18
Several copper(I) iminopyrrolidinates have been evaluated by thermogravimetric analysis (TGA) and solution based H-1 NMR studies to determine their thermal stability and decomposition mechanisms. Iminopyrrolidinates were used as a ligand for copper(I) to block previously identified decomposition routes of carbodiimide deinsertion and beta-hydrogen abstraction. The compounds copper(I) isopropyl-iminopyrrolidinate (1) and copper(I) tert-butyl-iminopyrrolidinate (2) were synthesized for this study, and compared to the previously reported copper(I) tert-butyl-imino-2,2-dimethylpyrrolidinate (3) and the copper(I) guanidinate [Me2NC((PrN)-Pr-1)(2)Cu](2) (4). Compounds 1 and 2 were found to be volatile yet susceptible to decomposition during TGA. At 165 degrees C in C6D6, they had half-lives of 181.7 h and 23.7 h, respectively. The main thermolysis product of 1 and 2 was their respective protonated iminopyrrolidine ligand. beta-Hydrogen abstraction was proposed for the mechanism of thermal decomposition. Since compound 3 showed no thermolysis at 165 degrees C, it was further studied by chemisorption on high surface area silica. It was found to eliminate an isobutene upon chemisoption at 275 degrees C. Annealing the sample at 350 degrees C showed further evidence of the decomposition of the surface species, likely eliminating ethene, and producing a surface bound methylene diamine.