17066-08-9Relevant academic research and scientific papers
Aza-macrocycles bearing lipophilic functions. Their synthesis and selective lithium complexation
Bencini, Andrea,Fusi, Vieri,Giorgi, Claudia,Micheloni, Mauro,Nardi, Nicoletta,Valtancoli, Barbara
, p. 2297 - 2302 (2007/10/03)
The synthesis of the novel macrobicyclic ligands 44,9-dimethyl-4 1,4,7,9-tetraaza-l(1,4)-benzena-4(1,7)-cyclododecanacyclohexaphane (L2) and 5-dodecyl-12,17-dimethyl-1,5,9,12,17-pentaazabicyclo[7.5.5]nonadecane (L3) is reported. The protonation constants of L2, together with those of the macrobicycles L4 and L5, have been potentiometrically determined both in water and in water-DMSO mixture (80:20, v/v, NaCl 0.15 mol dm-3, 298.1 K). Coordination of Li+ by these macrobicycles has been studied by means of 13C and 7Li NMR techniques. All ligands bind Li+ in aqueous solution, while the other alkali metal ions are not complexed. Lithium complexation is achieved through the encapsulation of the metal ion into the cavity of the macrobicycle. The remarkable selectivity is due to the small dimension of the macrobicyclic cavity, in which only Li+ can be lodged. The stability constants of the lithium complexes have been determined in water and in water-DMSO mixture (80:20, v/v, NaCl 0.15 mol dm-3, 298.1 K) by means of potentiometric measurements.
NMR STUDY OF PRODUCTS OF NUCLEOPHILIC ADDITION OF HIGHER PRIMARY ALIPHATIC AMINES TO ACRYLIC ACID
Mikhalkin, A. P.,Gorshkova, L. V.,Rybalka, I. G.
, p. 1815 - 1816 (2007/10/03)
The structures of products of nucleophilic addition of higher primary aliphatic amines (C12, C18, and C18:1) to acrylic ac id have been studied by 1H and 13C NMR spectroscopy.
