P 7569 (OTTO) Phosphorus(V) oxide, 99.995% Cas 1314-56-3 - used for the solvent-free and microwave-assisted preparation of 1, 5-benzodiazepine analogs. P 7569 (OTTO) Phosphorus(V) oxide, 99.995% Cas 1314-56-3 - used for the transformation of alcohols into the corresponding alkyl iodides and bromides.