New donor-functionalized Cp ligands: Synthesis and complexation behaviour of quinoxalyl and benzothiadiazolyl systems was written by Schuhen, Katrin;Sieb, David;Wadepohl, Hubert;Enders, Markus. And the article was included in Zeitschrift fuer Anorganische und Allgemeine Chemie in 2009.Recommanded Product: 5,8-Dibromoquinoxaline This article mentions the following:
Sodium cyclopentadienide reacts as nucleophile with 4,7-dibromo-2,1,3-benzothiadiazole (BTZ) and leads to the new donor-functionalized ligand CpBTZ. Related quinoxalyl Cp systems have been prepared using Pd-catalyzed coupling with zincated Cp-metal complexes. The new ligands comprise two N-donor atoms; one of them is located in a distal position relative to the metal center so that it cannot coordinate in a chelating manner. With CpBTZ ligand derivatives several metal complexes have been synthesized. The new chromium(III) complex CpBTZCrCl2 (12) becomes upon activation an active catalyst for the polymerization of ethylene. Relying on DFT calculations and anal. of spin-d. distribution combined with paramagnetic NMR data a chelating coordination of the CpBTZ ligand is feasible in 12. In the experiment, the researchers used many compounds, for example, 5,8-Dibromoquinoxaline (cas: 148231-12-3Recommanded Product: 5,8-Dibromoquinoxaline).
5,8-Dibromoquinoxaline (cas: 148231-12-3) belongs to pyrazine derivatives. Pyrazine has the elements of symmetry for the point group D2h. It has three mutually perpendicular two-fold axes. It also has three mutually perpendicular planes of symmetry. As a result, pyrazine also has a centre of symmetry. Pyrazines undergo nearly all of the same reactions as pyrimidines, from nucleophilic substitution (SNAr) to palladium-catalyzed cross coupling reactions.Recommanded Product: 5,8-Dibromoquinoxaline