87005-22-9Relevant academic research and scientific papers
Rh(iii)-Catalyzed regioselective mono- and di-iodination of azobenzenes using alkyl iodide
Li, Jixing,Cong, Wenxia,Gao, Zeng,Zhang, Jinlong,Yang, Huameng,Jiang, Gaoxi
, p. 3479 - 3486 (2018/05/23)
A new approach for highly regioselective iodination of azobenzenes with alkyl iodide as the iodinating reagent enabled by Rh-catalyzed oxidative C-H activation has been developed. By changing the oxidant, various mono- and di-iodinated azobenzenes were smoothly obtained in moderate to excellent yields, respectively. The preliminary mechanistic study reveals that the reaction process might undergo electrophilic substitution of the directed ortho metalated five-membered rhodacycle compound by an iodine cationic species generated in situ from alkyl iodide and oxidant.
Crucial role of N...Si interactions in the solid-state coloration of disilylazobenzenes
Yamamura, Masaki,Kano, Naokazu,Kawashima, Takayuki,Matsumoto, Tomonari,Harada, Jun,Ogawa, Keiichiro
experimental part, p. 8244 - 8249 (2009/04/11)
(Chemical Equation Presented) 2,2′-Bis(fluorodiphenylsilyl) azobenzenes bearing two methyl and butyl groups at the 4- and 4′-positions were synthesized, and their X-ray crystallographic analyses revealed that they have tetracoordinated and pentacoordinated silicon atoms, respectively. Although the two compounds showed almost the same spectra in solution, the reflectance spectra of the solid revealed that the pentacoordinated state had a weaker absorbance in the long-wavelength region compared with that of the tetracoordinated state, which is ascribed to the shift of the n-π* transition. This difference in the absorptions due to the n-π* transition drastically affects the color of the azobenzenes: the color of the pentacoordinated state becomes apparently paler than that of the tetracoordinated state.
