Data are presented for the synthesis, purification and physical properties of eight dicyclic hydrocarbons, consisting of the Q, W and a, w-diphenylpentanes and diphenylhexanes and the corresponding dicyclohexylalkanes. Melting point values are given for each of these hydrocarbons, all of which have been prepared in a state of purity of 99 mole%, or better. The kinematic viscosity at four temperatures and the heat of combustion are included in ...