110684-48-5Relevant articles and documents
2,5-Bis(azulenyl)pyrrolo[3,2-b]pyrroles-the key influence of the linkage position on the linear and nonlinear optical properties
Poronik, Yevgen M.,Mazur, Leszek M.,Samo?, Marek,Jacquemin, Denis,Gryko, Daniel T.
, p. 2620 - 2628 (2017)
The first route towards pyrrolo[3,2-b]pyrroles containing two azulene moieties at positions 2 and 5 was developed. The key step of this approach is the three-step transformation of pyridine scaffolds into azulene via sequential N-arylation followed by ring-opening and a reaction with cyclopentadiene. The resulting quadrupolar acceptor-donor-acceptor compounds possess interesting optical properties such as bathochromically shifted absorption with the magnitude of the red-shift strongly dependent on the linkage position. Two-photon absorption of these functional dyes is markedly different from that of previously described pyrrolo[3,2-b]pyrroles. The experimental optical spectra were rationalized using time-dependent density functional theory calculations of both the linear and nonlinear optical properties.
Sulfonic acid supported on hydroxyapatite-encapsulated-γ-Fe 2O3 nanocrystallites as a magnetically separable catalyst for one-pot reductive amination of carbonyl compounds
Deng, Jia,Mo, Li-Ping,Zhao, Fei-Yang,Hou, Lan-Lan,Yang, Li,Zhang, Zhan-Hui
experimental part, p. 2576 - 2584 (2011/10/18)
A novel, environmentally friendly procedure has been developed for the preparation of secondary or tertiary amines by one-pot reductive amination of carbonyl compounds using sodium borohydride in the presence of a magnetically recoverable sulfonic acid supported on hydroxyapatite-encapsulated-γ- Fe2O3 [γ-Fe2O3@HAP-SO 3H] at room temperature. The catalyst was easily separated from the reaction mixture by applying an external magnet and reused for six cycles without significant loss of catalytic activity.