A diaryl carbonate with a high degree of purity is produced at a high yield by (A) subjecting (a) a diaryl oxalate and a phenol compound or (b) an alkylaryl oxalate to transesterification reaction in one or two stages in the presence of a catalyst to prepare a diaryl oxalate, while removing a ...http://www.google.es/patents/US5811573?utm_source=gb-gplus-sharePatente US5811573 - Process for producing a diaryl carnonate
