121133-22-0Relevant articles and documents
Thiolate-Protected Au 25 (SC 2 H 4 Ph) 18 Nanoclusters as a Catalyst for Intermolecular Hydroamination of Terminal Alkynes
Nagata, Tatsuki,Adachi, Yurina,Obora, Yasushi
, p. 2655 - 2659 (2018)
Au 25 (SC 2 H 4 Ph) 18 nanoclusters have high catalytic activity for hydroamination of terminal alkynes. This reaction proceeds under O 2 or air. The presence of molecular oxygen has a profound effect
Linear free-energy relationships applied to the 13C NMR chemical shifts in 4-substituted N-[1-(pyridine-3- and -4-yl)ethylidene]anilines
Ran?ic, Milica,Tri?ovic, Nemanja,Mil?ic, Milo?,Jovanovic, Maja,Jovanovic, Bratislav,Marinkovic, Aleksandar
, p. 1442 - 1451 (2015/04/27)
Two series of 4-substituted N-[1-(pyridine-3- and -4-yl)ethylidene]anilines have been synthesized using different methods of conventional and microwave-assisted synthesis, and linear free-energy relationships have been applied to the 13C NMR chemical shifts of the carbon atoms of interest. The substituent-induced chemical shifts have been analyzed using single substituent parameter and dual substituent parameter methods. The presented correlations describe satisfactorily the field and resonance substituent effects having similar contributions for C1 and the azomethine carbon, with exception of the carbon atom in para position to the substituent X. In both series, negative ρ values have been found for C1' atom (reverse substituent effect). Quantum chemical calculations of the optimized geometries at MP2/6-31G++(d,p) level, together with 13C NMR chemical shifts, give a better insight into the influence of the molecular conformation on the transmission of electronic substituent effects. The comparison of correlation results for different series of imines with phenyl, 4-nitrophenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl group attached at the azomethine carbon with the results for 4-substituted N-[1-(pyridine-3- and -4-yl)ethylidene]anilines for the same substituent set (X) indicates that a combination of the influences of electronic effects of the substituent X and the π1-unit can be described as a sensitive balance of different resonance structures.
3-arylcarbonyl-1-(C-attached-N-heteryl)-1H-indoles
-
, (2008/06/13)
2-R2 -R4 -substituted-3-R3 -CO-1-[(C-attached-N-herteryl)-(Alk)n ]-1H-indoles useful as analgesic, anti-rheumatic, anti-inflammatory or anti-glaucoma agents.