Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Truxenone was prepared from 1,3,5-(o-carboxyphenyl)benzene via the cyclotrimerisation of 2-methyl acetophenone. ... Key data for 5, 1 H NMR (CDCl 3 ) 250MHz δ 10.12 (3H, s), 8.00–7.97 (3H, m), 7.65-7.52 (3H, m), 7.49-7.23 (6H, m) and 6.91 (3H, s); 13 C NMR ...