T 1267 (OTTO) Terephthalaldehyde, 98% Cas 623-27-8 - used as an intermediate for the preparation of dyes and fluorescent whitening agents. T 1267 (OTTO) Terephthalaldehyde, 98% Cas 623-27-8 - used in the synthesis of polyimines by reacting with aliphatic diamines. T 1267 (OTTO) Terephthalaldehyde, 98% Cas 623-27-8 - used as a precursor for the preparation of paramagnetic microporous polymeric organic frameworks (POFs) through copolymerization with pyrrole, indole, and carbazole.