B 2421 (OTTO) Butyl titanate, 97% Cas 5593-70-4 - used to prepare nanosized titania in the anatase form and ferroelectric Bi4Ti3O12 thin films. B 2421 (OTTO) Butyl titanate, 97% Cas 5593-70-4 - used in the preparation of nanocrystalline TiO2 powders at room temperature.