Treatment of osmapentalyne [Os { ≡C-C（COOMe）=CH-C =CH-C（PPh3） =CH-}Cl（PPh3）2]＋ BF4-with arylamines in the presence of Cs2CO3 produced osmium-bridged polycyclic aromatic complexes.In this reaction,metal carbyne...Treatment of osmapentalyne [Os { ≡C-C（COOMe）=CH-C =CH-C（PPh3） =CH-}Cl（PPh3）2]＋ BF4-with arylamines in the presence of Cs2CO3 produced osmium-bridged polycyclic aromatic complexes.In this reaction,metal carbyne of osmapentalyne was first attacked by nucleophiles,followed by a C-H oxidative addition.The UV-Vis spectra of these osmium-bridged polycyclic aromatic complexes were measured.The result shows that these osmium-bridged polycyclic aromatic complexes have broad absorption in the UV-Vis region up to 650 nm.展开更多
A highly efficient method for the synthesis of unsymmetrical multi-substituted 1,2,3-triazoles via a direct Pd-NHC system catalyzed C（5）-arylation of 1,4-disubstituted triazoles, which are readily accessible via ＂c...A highly efficient method for the synthesis of unsymmetrical multi-substituted 1,2,3-triazoles via a direct Pd-NHC system catalyzed C（5）-arylation of 1,4-disubstituted triazoles, which are readily accessible via ＂click＂ chemistry has been developed. It is important to note that C--H bond functionalizations of 1,2,3-triazoles with a variety of differently substituted aryl iodides and bromides as electrophiles can be conveniently achieved through this catalytic system at significantly milder reaction temperatures of 100 ℃ under air.展开更多
A novel domino cross dehydrogenative coupling of 2-aryl acetals with unmodified ketones has been developed, using DDQ as both the oxidant and reactant precursor.
A new approach to synthesize N-alkylation of azoles by iron（III）-catalyst under solvent-free conditions was de- veloped. The method is broad in scope and highly efficient.
文摘Treatment of osmapentalyne [Os { ≡C-C（COOMe）=CH-C =CH-C（PPh3） =CH-}Cl（PPh3）2]＋ BF4-with arylamines in the presence of Cs2CO3 produced osmium-bridged polycyclic aromatic complexes.In this reaction,metal carbyne of osmapentalyne was first attacked by nucleophiles,followed by a C-H oxidative addition.The UV-Vis spectra of these osmium-bridged polycyclic aromatic complexes were measured.The result shows that these osmium-bridged polycyclic aromatic complexes have broad absorption in the UV-Vis region up to 650 nm.
文摘A highly efficient method for the synthesis of unsymmetrical multi-substituted 1,2,3-triazoles via a direct Pd-NHC system catalyzed C（5）-arylation of 1,4-disubstituted triazoles, which are readily accessible via ＂click＂ chemistry has been developed. It is important to note that C--H bond functionalizations of 1,2,3-triazoles with a variety of differently substituted aryl iodides and bromides as electrophiles can be conveniently achieved through this catalytic system at significantly milder reaction temperatures of 100 ℃ under air.
文摘A novel domino cross dehydrogenative coupling of 2-aryl acetals with unmodified ketones has been developed, using DDQ as both the oxidant and reactant precursor.
基金We are grateful for the support of this project from the Scientific Research Foundation of the State Educa- tion Ministry （No. 107108） and the National Natural Science Foundation of China （No. J0730425）.
文摘A new approach to synthesize N-alkylation of azoles by iron（III）-catalyst under solvent-free conditions was de- veloped. The method is broad in scope and highly efficient.
