Triarylmethanes have attracted much attention as leuco dyes, 1, 1a, 1b and 1c protecting groups 2 and photochromic agents. 3 Furthermore, the ring hydroxylated triarylmethanes show antitumor and antioxidant properties. 4, 4a and 4b Within the context of wide-ranging applications of triarylmethanes, triheteroarylmethanes find many applications in non-linear optics and conducting polymers. 5, 5a, 5b, 5c and 5d Diheteroarylmethanes are also used in the food industry ...