P 2803 (OTTO) 2-Phenylethyl bromide, 98% Cas 103-63-9 - used in the preparation of phenelzine by reacting with hydrazine. P 2803 (OTTO) 2-Phenylethyl bromide, 98% Cas 103-63-9 - used as a starting material to prepare various beta-phenethyl derivatives, active pharmaceutical ingredients, and fragrances.