// Definition
A chemical reaction where residual sulfur in cannabis extracts converts THC to hexahydrocannabinol (HHC) during distillation. This disproportionation reaction produces 2 moles of HHC for every 1 mole of CBN formed, as hydrogen transfers between THC molecules facilitated by sulfur.
// From the Episode
Dr. Mark Scialdone explained that his lab patented HHCA and discovered that sulfur contamination in extracts causes unintended HHC formation during distillation. He described a commercially available 2:1 HHC-to-CBN product made by intentionally treating THC with sulfur. He also explained that THC naturally converts to CBN via oxidation, and that white smoke from overheated distillate is water vapor from this hydrogen-transfer reaction. Eagle 20 fungicide generates hydrogen cyanide when heated.