Axially chiral amidines and guanidines. some possessing C-2-symmetry, have
been targeted as potential chiral catalysts for reactions of alpha,beta -un
saturated carboxylic acids or esters. The key step in each synthesis requir
ed the coupling of two sterically demanding aromatic compounds to form atro
pisomeric biaryl species. (C) 2000 Elsevier Science Ltd. All rights reserve
d.