Carbonyldiimidazolide acid anhydride synthesis

The use of imidazolides in organic synthesis has been propagated by Staab and coworkers." " Acid anhydrides can also be prepared with carbonyldiimidazolide. The reaction of a carboxylic acid with this reagent leads to acid anhydride if the transacylation equilibrium (equation 35) can be shifted to the side of the anhydride. This is possible either if the acid is used in twofold excess and forms an insoluble salt with the liberated imidazole or if trifluoro- or trichloro-acetylimidazolide is taken as the reagent. Symmetrical acid anhydrides can be obtained in a number of cases in good yield according to equation (36). 20... 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

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