Synthesis and enantioselective coloration of optically active azophenolic acerands incorporating two 1,1′-binaphthyl moieties as the chiral centre

Two chiral azophenolic acerands 2 and 3 with two 1,1′-binaphthyl moieties as the chiral centre have been prepared, and their chiral recognition properties based on enantiomeric amine-selective coloration have been examined; the host 3 shows a higher enantioselective coloration than the host 2 with a variety of primary amines.