... Soc. D, 1969, 728-729. Dialkyl dithiol tricarbonates and dialkyl tricarbonates. (Note: The full text of this document is currently only available in the PDF Version ). CS Dean and DS Tarbell. The action of phosgene on sodium t-butyl carbonate gives the crystalline di-t-butyl tricarbonate, mp 64–65°, which when subjected to heat breaks down into 3 moles of carbon dioxide, one mole of isobutene and one mole of t-butyl alcohol.