List of patentees to whom patents were issued on the 13th day of march, 2018 and to whom reexamination certificates and patent trial and appeal board certificates were issued.
A simple and practical synthesis of soluble hexa- peri-hexabenzocoronene ( HBC) from readily available hexaphenylbenzene ( HPB) is described. In this simple procedure, the substitution of the free para positions of the propeller-shaped HPB with tert-butyl groups and the oxidative cyclodehydrogenation to planar HBC is achieved in a one-pot reaction using ferric chloride both as a Lewis acid catalyst and as an oxidant in excellent yields.
The ready availability of HBC allows the isolation of its pure cation-radical salt using a variety of chemical oxidants such as antimony pentachloride and triethyloxonium and nitrosonium hexachloroantimonate salts.
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