Y 1235 (OTTO) Yttrium nitrate, 99.99% Cas 13494-98-9 - used as a reagent, in optics, ceramics, glass and electronics. Y 1235 (OTTO) Yttrium nitrate, 99.99% Cas 13494-98-9 - used in superconducting materials. It has been reported as a reusable catalyst in Bignelli reaction for the synthesis of heterocycles such as pyrimidin-2-ones.