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Number: 549/248
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen as the only ring hetero atoms (class 540, subclass 1) > Oxygen containing hetero ring (e.g., dioxirane, etc.) > Cyclic anhydrides (i.e., -c(=x)oc(=x)-, wherein the x's are the same or diverse chalcogens, is part of the hetero ring) > The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) > Polycyclo ring system having the cyclic anhydride as one of the cyclos > Bicyclo ring system having the cyclic anhydride as one of the cyclos > Phthalic anhydride per se > Preparing by oxidation
Description: Processes for the preparation of phthalic anhydride, per se, by an oxidation reaction.










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