1559074-13-3Relevant academic research and scientific papers
Non-chelating polydentate N -heterocyclic carbenes through assembly approaches
Lin, Ya-Fan,Liu, Chih-Hsun,Hu, Chung-Hao,Chiu, Ching-Wen
, p. 613 - 617 (2016/04/20)
Bridging-type polydentate N-heterocyclic carbene (NHC) ligands are valuable building blocks for organometallic supramolecules. In order to quickly expand the ligand library of poly-NHC, we have assembled several bi-functional carbene precursors with spiroborate, phthalimide and metal-carboxylate to yield poly-NHC ligands with various denticities and geometries. Condensation of 4,5-dihyxdroxy-N,N′-diaryl-benzimidazolium and arylboronic acids leads to a spiroborate-linked bis-benzimidazolium salt, which can be further deprotonated to give a linear anionic bis-NHC. The second approach utilizes the dehydrative condensation of phthalic anhydride functionalized benzimidazole with poly-anilines to afford a series of poly-benzimidazole compounds, which can be converted into the corresponding poly-nuclear metal-NHC complexes after alkylation and metalation. The introduction of a benzoate group to bi-functional carbene precursor facilitates the assembly of poly-benzimidazolium salts with metal salts leading to MCl2 (M=Zn, Co)-linked C2h symmetric bis-benzimidazoliums and a penta-Zn cluster-linked tetra-benzimidazolium.
Non-chelating polydentate N -heterocyclic carbenes through assembly approaches
Lin, Ya-Fan,Liu, Chih-Hsun,Hu, Chung-Hao,Chiu, Ching-Wen
, p. 613 - 617 (2016/04/20)
Bridging-type polydentate N-heterocyclic carbene (NHC) ligands are valuable building blocks for organometallic supramolecules. In order to quickly expand the ligand library of poly-NHC, we have assembled several bi-functional carbene precursors with spiroborate, phthalimide and metal-carboxylate to yield poly-NHC ligands with various denticities and geometries. Condensation of 4,5-dihyxdroxy-N,N′-diaryl-benzimidazolium and arylboronic acids leads to a spiroborate-linked bis-benzimidazolium salt, which can be further deprotonated to give a linear anionic bis-NHC. The second approach utilizes the dehydrative condensation of phthalic anhydride functionalized benzimidazole with poly-anilines to afford a series of poly-benzimidazole compounds, which can be converted into the corresponding poly-nuclear metal-NHC complexes after alkylation and metalation. The introduction of a benzoate group to bi-functional carbene precursor facilitates the assembly of poly-benzimidazolium salts with metal salts leading to MCl2 (M=Zn, Co)-linked C2h symmetric bis-benzimidazoliums and a penta-Zn cluster-linked tetra-benzimidazolium.
A spiroborate-based anionic bis-N-heterocyclic carbene
Su, Jia-Hong,Lee, Gene-Hsiang,Peng, Shie-Ming,Chiu, Ching-Wen
supporting information, p. 3059 - 3062 (2014/03/21)
A twisted mono-cationic bis-benzimidazolium salt was serendipitously isolated from the dehydrative condensation of 5,6-dihydroxyl-1,3-dimesityl- benzimidazolium and 1,4-benzenediboronic acid. Subsequent deprotonation of the benzimidazolium salt led to the formation of a spiroborate-linked free bis-NHC, which was further transformed into the corresponding diborane adduct and the di-Rh complex.
