P 0334 (OTTO) Potassium thiocyanate, ≥99.0% Cas 333-20-0 - used in the preparation of ethylenesulfide, lead thiocyante, which is used in the convertion of acyl chloride to thiocyanates. P 0334 (OTTO) Potassium thiocyanate, ≥99.0% Cas 333-20-0 - used in the synthesis of the following α-Amino nitriles from tertiary amines.