2016-08-242016-08-241994-04-12http://hdl.handle.net/10919/72810Novel bis(extraannular functionally-substituted phenylene) crown compounds, useful as chelating agents or in the synthesis of condensation polymers containing large semi-rigid macrocycles in the polymer backbone, are described. A broad range of functional groups (preferably in the 5-position) can be used in the 1,3-phenylene varieties. Carboxy functional groups are used in certain novel 1,2-phenylene crowns.application/pdfen-USPatenthttp://pimg-fpiw.uspto.gov/fdd/29/027/053/0.pdf7686087549/349C07D323/00C08G18/771C08G18/3215C08G63/185C08G63/193C08G69/26C08G71/025302729