(TMB, 98%), 1,3,5-benzenetricarbonyl chloride (TMC, 98+%), benzimidazole
(BI, 99%), and glacial acetic acid (CH3CH2COOH,
99+%) were purchased from Alfa Aesar (Heysham, UK). Tris(3-hydroxypropyltriazolylmethyl)amine
(THPTAMA, 95%), triethylamine (TEA, Et3N, 99%), 1,3,5-tris(2-hydroxyethyl)isocyanurate
(THEIC, 97%), benzene-1,3,5-tricarboxaldehyde (97%), 1,3,5-trimethylbenzene
(mesitylene, 98%), N,N-dimethylformamide
(DMF, anhydrous, 99.8%), tetrahydrofuran (THF, anhydrous, 99.8%),
and 1,4-dioxane (anhydrous, 99.8%) were purchased from Sigma-Aldrich
(St. Louis, Missouri, USA). All chemicals were of reagent grade and
used as purchased.