A series of Pc 4 related compounds consisting of OH-substituted derivatives, Pc 4 salts and Pc 4 OH-substituted derivative salts has been prepared. The salts have been synthesized by straightforward acid-base reactions. Solubility studies of the Pc 4, the OH-substituted derivatives, the Pc 4 salts and the OH-substituted derivative salts in representative organic solvents and in aqueous dispersant-containing solutions have been carried out. Different dosage forms of Pc 4 including a liquid salt, aqueous solutions, a mineral oil solution, gels, a cream, and water-swellable films have been formulated.
In addition, membrane penetration studies of the formulation of Pc 4 used in a completed Phase I clinical trial done at University Hospitals of Cleveland have been conducted. Polyurethane, cellulose, polyvinylidene fluoride, silicone, pig keratome, and human roof blister membranes have been used in the study.
In unrelated work, the known polymers, chrysotile-derived trimethylsiloxy scroll polymer, and chrysotile-derived vinyldimethylsiloxy scroll polymer have been made. Also, the new polymers chrysotile-derived trimethylsiloxy-3-cyanopropylmethylmethoxysiloxy scroll polymer and chrysotile-derived vinyldimethylsiloxy-3-cyanopropylmethylmethoxysiloxy scroll polymer, have been made by a novel pendent group-exchange reaction. Finally, partially platinum-filled scrolls have been prepared.