115663-05-3Relevant academic research and scientific papers
Cyclopentadienyl-Ru(II)-Pyridylamine Complexes: Synthesis, X-ray Structure, and Application in Catalytic Transformation of Bio-Derived Furans to Levulinic Acid and Diketones in Water
Dwivedi, Ambikesh D.,Sahu, Vinod K.,Mobin, Shaikh M.,Singh, Sanjay K.
supporting information, p. 4777 - 4787 (2018/04/25)
A series of cationic half-sandwich cyclopentadienyl-ruthenium(II)-pyridylamine complexes, [(η5-C5H5)Ru(κ2-L)(PPh3)]+ (L = Namine-substituted pyridylamine ligands) ([Ru]-1-[Ru]-6), along with the analogous cyclopentadienyl-ruthenium(II)-N-isopropylpyridylimine complex [(η5-C5H5)Ru(κ2-L)(PPh3)]+ (L = N-isopropylpyridylimine) ([Ru]-7), have been synthesized in good yields. Structural identities of all the complexes have been authenticated by 1H, 13C, and 31P NMR, mass spectrometry, and X-ray crystallography. The synthesized complexes exhibited high catalytic activity for the transformation of the bio-derived furans, 2-furfural (furfural), 5-methyl-2-furfural (5-MF), and 5-hydroxymethyl-2-furfural (5-HMF) to levulinic acid (LA) and the diketones, 3-hydroxyhexane-2,5-dione (3-HHD), 1-hydroxyhexane-2,5-dione (1-HHD), and hexane-2,5-dione (HD) in water. Efficient transformation of furfural to LA over a range of η5-Cp-Ru-pyridylamine complexes is substantially affected by the Namine-substituents, where a η5-Cp-Ru-N-propylpyridylamine complex ([Ru]-2) exhibited higher catalytic activity in comparison to other η5-Cp-Ru-pyridylamine and η5-Cp-Ru-pyridylimine complexes. The relative catalytic activity of the studied complexes demonstrated a substantial structure-activity relationship which is governed by the basicity of Namine, steric hindrance at Namine, and the hemilabile nature of the coordinated pyridylamine ligands.
Polarography of Pyridine-2-carbaldehyde 2-Pyridylhydrazone in Solutions of Varying pH at a Dropping-mercury Electrode: Effect of Surface-active Substance
Zuhri, Ali Z. Abu,Shalabi, Jamal S.
, p. 499 - 502 (2007/10/02)
The polarographic behaviour of pyridine-2-carbaldehyde 2-pyridylhydrazone (PAPH) at a dropping-mercury electrode was studied in aqueous Britton-Robinson buffers containing 50percent ethanol.The polarograms consist of one wave in the acidic and alkaline medium.Two electrons are consumed in the splitting of the N-N bond to give 2-aminopyridine and pyridine-2-carbaldehyde.The adsorption effects of cationic, anionic, and non-ionic surfactants on the polarographic waves of PAPH have been investigated.The kinetic parameters for the electrode reaction at different pH values have been computed.
