Patent ID: 6020514
Filing Date: 2000-02-01
Classification: C07C,Y02P

Abstract:
A process for producing di-tert-butyl dicarbonate, which comprises:(A) the step of reacting an alkali metal with tert-butyl alcohol in an amount of at least 5 moles of the tert-butyl alcohol, based on one mole of the alkali metal to form an alkali metal tert-butoxide;(B) the step of introducing carbon dioxide into the reaction mixture obtained in the step (A), without isolating the alkali metal tert-butoxide from the reaction mixture to form a mono-tert-butyl alkali metal carbonate; and(C) the step of mixing and reacting an aromatic sulfonyl halide and a tertiary amine with the reaction mixture obtained in the step (B), without isolating the mono-tert-butyl alkali metal carbonate from the reaction mixture, to form di-tert-butyl dicarbonate,wherein the solvent of each reaction step is(I) a mixture of tert-butyl alcohol and an inert solvent other than the tert-butyl alcohol, and the other inert solvent is used in an amount of 0.1 part by volume or less, based on 1 part by volume of the tert-butyl alcohol, or(II) only tert-butyl alcohol.