4-Isocyanatobenzoyl chloride may be used:as starting reagent in the isomeric isocyanatobenzoic acid isocyanatophenyl estersin the synthesis of novel triaromatic diisocyanates based onpara-linked ester mesogens (1,4-phenylene dibenzoate, diphenyl terephthalate, diphenyltrans-1,4-cyclohexanedicarboxylate andtrans-dicyclohexyltrans-1,4-cyclohexanedicarboxylate)in the synthesis of a dual-functional building intermediate, 4-(3,3-diethyl-2,4-dioxoazetidin-1-yl)benzoyl chloride (DEDA-BC)