Method is used to prepare DITERT-BUTYLSUCCINATE and its use, is used to prepare Isosorbide-5-Nitrae DIKETOPYRROLO- 3,4-c-pyrrole pigment

摘要

In the di-tert. of the public formula (I) of the esterification of the proton catalysis by the succinic acid (IIA) with isobutene (III)In the preparation process of butyl succinic acid, (IIA) and/or succinic anhydride (IIB) are reacted in a kind of aqueous acidic esterification catalysts of a concentration 95 weight % rather than under the conditions of sulfuric acid (H2SO4) is existing with (III);