[C:1]([O-:8])(=[O:7])/[CH:2]=[CH:3]\[C:4]([O-:6])=[O:5].[NH4+:9].[NH4+].[CH3:11][OH:12]>O>[C:1]([O-:8])(=[O:7])/[CH:2]=[CH:3]\[C:4]([O-:6])=[O:5].[NH4+:9].[NH4+:9].[CH3:11][OH:12]At an overall pressure of 200 bar and a reactor internal temperature of 250° C., the hourly amounts indicated in Table 1 of diammonium maleate as a 45% strength solution in water, and methanol were fed into the reactor (circulation 9 1/h). Analysis of the liquid reactor product (distillation, GC) gave the following composition (Table 1, the data in mol % in each case relate to the diammonium maleate employed).
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