Abstract: Provided is a method for producing fluorenone comprising an oxidation step of oxidizing fluorene in the presence of an aliphatic carboxylic acid having 2 to 3 carbon atoms, a metal catalyst, a bromine compound, and oxygen, and a phosphoric acid treatment step of bringing an oxidation reaction mixture into contact with phosphoric acid in the order indicated.

Abstract: An information delivery system includes: a delivery destination device; and a delivery provision server. The delivery provision server includes: a memory; and a controller. The controller performs: a request process; a receiving process; and a delivery process. The request process transmits a request for specific delivery information to a delivery management server. The specific delivery information is delivery information satisfying a predetermined condition. The predetermined condition includes a requirement that the delivery information be suited to user information corresponding to user identification information associated with delivery destination identification information by association information stored in the memory. The receiving process receives, in response to the request, the specific delivery information from the delivery management server.

Abstract: An information delivery system includes a delivery provision server and a delivery destination device. The delivery provision server includes a controller configured to: select a first piece of layout information from a plurality of pieces of layout information; acquire one or more pieces of first information for one or more first delivery frames defined by the first piece of layout information; create, when determining for each of the one or more first delivery frames that a piece of first information is placeable in the first delivery frames from among at least one piece of first information acquired for the first delivery frame, first delivery information in which the one or more first delivery frames are arranged according to the first piece of layout information with each placeable piece of first information placed in the corresponding first delivery frame; and provide the created first delivery information to the delivery destination device.

Abstract: A method for producing fluorenone including a pretreatment step of heating fluorene in the presence of a lower aliphatic carboxylic acid, a bromine compound, and a metal catalyst, and an oxidation step of continuously supplying fluorene and oxygen to perform an oxidation reaction, in the order indicated.

Abstract: Provided is a method for producing fluorenone comprising an oxidation step of oxidizing fluorene in the presence of an aliphatic carboxylic acid having 2 to 3 carbon atoms, a metal catalyst, a bromine compound, and oxygen, a solvent removal step of removing the aliphatic carboxylic acid, a heating step at 120 to 350° C., and a distillation step in the order indicated.