Synthesis of new chiral imidazolium salts derived from amino acids: their evaluation in chiral molecular recognition
作者:Belén Altava、Dalgi S. Barbosa、M. Isabel Burguete、Jorge Escorihuela、Santiago V. Luis
DOI:10.1016/j.tetasy.2009.03.028
日期:2009.5
A family of new imidazolium salts derivedfrom natural amino acids has been synthesized and tested for NMR enantiodiscrimination, as chiral shift reagents, of carboxylic acids. These imidazolium receptors contain different structural modifications and the splitting of the signals of the acids, after addition of the corresponding CSRs, depends on these structural variables. Compound 8b exhibited the
Chiral bisimidazolium salts derived from amino acids and their palladium(II)- and platinum(II)-biscarbene complexes
作者:Anke Meyer、Maria A. Taige、Thomas Strassner
DOI:10.1016/j.jorganchem.2009.01.036
日期:2009.5
good yields via a one-pot ring closing reaction, followed by esterification. The methylene bridged bisimidazolium iodide salts are accessible in moderate yields. Corresponding palladium(II)- and platinum(II)-NHC complexes could be synthesized and fully characterized, but do not show optical activity. We also report a solid state structure of one of the synthesized palladium(II) biscarbene compounds derived