105780-12-9Relevant articles and documents
Synthesis, silver (I) extraction and silver (I) binding studies of novel N 1,N 3-bis(2-(benzylthio)ethyl)propanediamide derivatives
Aderibigbe, Abiodun D.,Clark, Andrew J.
, p. 397 - 410 (2020/08/19)
Abstract: Solvent or liquid–liquid extraction represents a highly valuable technique for the selective recovery of metals from the aqueous phase due to the ease of operation and short turnaround times. Ligands bearing soft donor atoms including nitrogen and sulfur are ideal candidates for selective silver recovery due to their preference for silver binding. Herein, novel N1,N3-bis(2-(benzylthio)ethyl)propanediamide derivatives bearing sulfur and nitrogen donor atoms were prepared in low to high yields and tested for Ag+ extraction from ternary aqueous solutions also containing Cu2+ and Pb2+ following a well-established solvent extraction protocol. It was observed that electronics effects at the 4-aryl position in the propanediamide (or malondiamide) derivatives had a significant effect on the selectivity, but little effect on the efficiency of Ag+ extraction with the 4-methoxy analogue proving the most selective. Steric hindrance provided by dimethyl substitutions at the α-positions to the sulfur atoms had negative effects on Ag+ extraction efficiency and selectivity, while diethyl steric hindrance at the methylene center lowered selectivity but increased extraction efficiency for Ag+. Detailed binding studies reveal that one of the malondiamide derivatives which lacked the electronic and steric hindrance groups studied coordinated Ag+ in a 1:1 fashion suggesting a tetrahedral complex geometry. Overall, the results show that simple modification of the electronics and sterics of the N1,N3-bis(2-(benzylthio)ethyl)propanediamides, can improve their selectivity for Ag+ recovery from the aqueous phase. Graphic abstract: [Figure not available: see fulltext.].
A one-pot, two step synthesis of 2,2-disubstituted 1-nitroalkenes
Jang, Yeong-Jiunn,Lin, Wen-Wei,Shih, Yuh-Kuo,Liu, Ju-Tsung,Hwang, Ming-Hsing,Yao, Ching-Fa
, p. 4979 - 4992 (2007/10/03)
The reactions of ketones 1a-o, nitromethane 2, and a stoichiometric amount of piperidine 3a or ethylenediamine 3b in the presence of mercaptan 6a in THF or CH3CN solution give high yields of β-nitrosulfides 7a-o. The latter can be oxidized by 8
Cationic complexes of technetium-99M
-
, (2008/06/13)
Tridentate mono-anionic ligands have the structure where each of X and Y is independently P, As or N, Z is phenol, thiophenol or thiol, and A and Q are hydrocarbon linking groups. The ligands from cationic complexes with Technetium-99m, e.g. [TcIII K2 ]+ where K is the ligand, having useful imaging properties.