Simple Access to Sol-Gel Precursors Bearing Fluorescent Aromatic Core Units was written by Hemgesberg, Maximilian;Ohlmann, Dominik M.;Schmitt, Yvonne;Wolfe, Monique R.;Mueller, Melanie K.;Erb, Benjamin;Sun, Yu;Goossen, Lukas J.;Gerhards, Markus;Thiel, Werner R.. And the article was included in European Journal of Organic Chemistry in 2012.SDS of cas: 148231-12-3 This article mentions the following:
Di-, tri-, and tetrathienyl-substituted polycyclic aromatic fluorophores were prepared from different aryldi-, aryltri-, or aryltetrahalides by a simple and fast Suzuki coupling. The reaction was optimized for the synthesis of the desired materials on multigram scale. The coupled products were converted into the corresponding iodides through iodination with N-iodosuccinimide. The iodides turned out to be versatile starting materials for applications, such as periodic mesoporous organosilica syntheses. They were converted into a variety of new trimethoxysilyl arenes by using a very efficient Pd-mediated C-Si cross-coupling, which was also extended to the corresponding thienyl bromides by using a dimeric Pd(I) catalyst. All compounds were characterized by 1H NMR, 13C NMR, 29Si NMR, and ATR-IR spectroscopy and HRMS. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3SDS of cas: 148231-12-3).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. A large number of pyrazine derivatives are known for their antitumor, antibiotic, anticonvulsant, antituberculosis, and diuretic activities.SDS of cas: 148231-12-3