Reported is a simple and sustainable strategy to catalytically convert SO2 gas into sulfate under ambient conditions utilizing ferrocene (SO2 + 2Fc + aerial O2 → Fc2SO4) and aerial oxygen.
Koneramines (L OR', R=Ph or Ts; R'=Me, iPr) and their complexes were found to emerge from the system of pyridine-2-carboxaldehyde and N-phenyl/tosylethylenediamine when a primary or secondary alcohol was used as solvent. Imidazolidinylpyridines (L , R=Ph or Ts) became major emergents whereas hemi-aminals (L OH, R=Ph or Ts) are minor emergents of the system when tertiary butanol was used as the solvent; the bulky tertiary butyl group prevented the addition of alcohol to the iminium ion that diverted the equilibrium towards imidazolidinylpyridines. By playing with the components of the reaction mixture, crystals of the metastable intermediates bound to copper(II) and/or zinc(II) were obtained and the structures were determined by X-ray diffraction analysis. The reported results shed light on how to control the emergents of the multicomponent reaction mixture that forms koneramines. Reactivity studies of the intermediates pave the way for a new type of koneramine complexes that are new dipicolylamines where the two pyridine moieties of the resulting koneramine are not the same.
Imidazolidinylpyridines, a new type of strictly face‐capping tridentate ligands, are reported as cheap and easily synthesizable alternates to well‐known crown and scorpionate ligands that are costly and cumbersome to be synthesized. The reported imidazolidinylpyridines have been made from the equimolar multicomponent mixture of N1,N2‐bis(substituted)ethane‐1,2‐diamine, pyridine‐2‐carboxaldehyde and MCl2, where M is Ni, Cu or Cd. The metal dependent formation of complexes of the expected imidazolidinylpyridine while using cadmium(II) ion and unexpected hemiaminal ethers when Ni(II)/Cu(II) was used are portrayed with the support of complete characterization including NMR spectroscopy, mass spectrometry and solid‐state structures.
We report the solvent-assisted mechanochemically synthesised mononuclear Ni(II) borohydride complex supported by a macrocyclic tetradentate ligand. It was characterised as stable high-spin [(L Me )Ni(η 2 -BH 4 )] + cation in solid-state and in solution by various physicochemical methods and capable of transferring hydride. The stoichiometric reactivity of [(L Me )Ni(η 2 -BH 4 )] + cation was examined with trityl cation, alkyl halide, disulphide, thiol, carboxylic acid and enol at room temperature.
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