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use of tautomeriefaehigen, fuenfgliedrigen aromatic n - heterocyclen as catalysts in the conversion of aromatic carbonsaeuren with 1, 2 - dioxacycloalkan - 2 - ions
use of tautomeriefaehigen, fuenfgliedrigen aromatic n - heterocyclen as catalysts in the conversion of aromatic carbonsaeuren with 1, 2 - dioxacycloalkan - 2 - ions