B 1775 (OTTO) Biphenyl, 99% Cas 92-52-4 - used in combination with Li metal for the generation of activated Ca metal. B 1775 (OTTO) Biphenyl, 99% Cas 92-52-4 - used as important starting material for the production of polychlorinated biphenyls. It is also an intermediate for the production of a host of other organic compounds.