Zm. Li et C. Jablonski, Synthesis and characterization of 'calixsalens': a new class of macrocyclic chiral ligands, CHEM COMMUN, (16), 1999, pp. 1531-1532
Template directed reaction of dialdehydes and (R,R)- or (S,S)-1,2-diaminocy
clohexane affords a practical route to chiral, metal-free macrocyclic salen
dimers which have a novel calixarene-like structure and show catalytic act
ivity for enantioselective epoxidation of unfunctionalized alkenes in the p
resence of Mn-III-NaOCl (aq.).