20185-22-2Relevant articles and documents
ELECTRONIC STRUCTURE OF ALKYLATED IMIDAZOLES AND ELECTRONIC SPECTRA OF TETRAKIS(IMIDAZOLE)COPPER(II) COMPLEXES. MOLECULAR STRUCTURE OF TETRAKIS(1,4,5-TRIMETHYLIMIDAZOLE)COPPER(II) DIPERCHLORATE.
Bernarducci,Bharadwaj,Krogh-Jespersen,Potenza,Schugar
, p. 3860 - 3866 (1983)
The synthesis, crystal structure, electronic spectra, and ESR spectra are reported for the title complex (1). Energies of the molecular orbitals and electronically excited states of imidazole and of several methylated imidazoles have been calculated. Ligand to metal charge-transfer (LMCT) absorptions of the title complex and other Cu(II)-imidazole complexes are discussed and compared. preliminary LMCT spectra are presented for the yellow diamagnetic tetrakis(1,2-dimethylimidazole)nickel(II) diperchlorate complex and its Cu(II) analogue. An experimental justification for assigning the charge-transfer absorptions as LMCT instead of MLCT is presented.
Syntheses of polyalkylated imidazoles
Evjen, Sigvart,Fiksdahl, Anne
supporting information, p. 1392 - 1399 (2017/07/25)
We have developed improved general simple methods for large-scale preparation of polyalkylated imidazoles by improved multicomponent synthesis from commercially available starting materials. A large range of NH- and N-alkyl-polyalkylimidazoles (40 in total, including novel compounds) has been synthesized.
Asymmetric Copper(II)-catalysed nitroaldol (Henry) reactions utilizing a chiral C1-symmetric dinitrogen ligand
Zhou, Yirong,Gong, Yuefa
experimental part, p. 6092 - 6099 (2011/11/29)
A series of stable chiral C1-symmetric dinitrogen ligands were conveniently synthesized in high yields by condensation of chiral amines [(-)-exo-bornylamine or (+)-(1S,2S,5R)-menthylamine] with various substituted imidazolecarbaldehydes. With the assistance of base, the ligand L1 in combination with CuCl2·2H2O (2.5 mol-% or 5.0 mol-%) can efficiently promote nitroaldol (Henry) reactions between a variety of aldehydes and nitromethane. Both aromatic and aliphatic aldehydes were tolerated in our catalytic system, affording the expected nitroalcohol products in high yields (up to 97%) and with good enantioselectivities (up to 96%) under mild reaction conditions. A series of chiral C1-symmetric dinitrogen ligands were conveniently synthesized in high yields by condensations of chiralamines with various substituted imidazolecarbaldehydes. The ligand L1 in conjunction with CuCl2·2H2O can efficiently promote nitroaldol (Henry) reactions between various aldehydes and nitromethane in high yields (up to 97%) and with good enantioselectivities (up to 96%).