Duajenis bisfenol yang mengandungi kumpulan azometina iaitu 3,3'-dimetoksi-4,4'dihidroksi-
N-benzilidina-o-tolidina (I) dan 4,4' -dihidroksi-N-benzilidina-o-tolidina
(II) telah disintesis melalui tindakbalas o-tolidina bersama vanillin dan phidroksibenzaldehid.
Two bisphenols containing azomethine groups namely, 3,3'-dimethoxy-4,4'dihydroxy-
N-benzylidene-o-tolidine (I) and 4,4' -dihydroxy-N-benzylidene-o-tolidine
(II) were synthesized by reaction of o-tolidine with vanillin and phydroxybenzaldehyde
