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Summary A simple reaction of 1,8-diaminonaphthalene and variousisocyanates provides the important anion receptors. Elec-tronic effect on the para position of the phenyl ring of theurea ligands do influence the anion binding significantly andnitration on naphthalene ring also influence the bindingproperties, but much less compared with the changes ofother side of urea group due to the structural easiness of N-H b protons for anion binding. Experimental1,8-Bis( N -phenylureido)naphthalene (1) 11 1,8-Bis( N -butylureido)naphthalene (2). To a stirredsolution 0.2 g (1.26 mmol) of 1.8-diaminonaphthalene in 30mL of THF/DMF (2:1 ratio), 0.55 mL (5.20 mmol) of butylisocyanate in THF 15 mL was added and the reaction mix-ture was refluxed for 24 hours under the nitrogen atmos-phere. The precipitate was occurred in reaction mixture. Thereaction mixture was cooled and filtered. The precipitatewas washed with MeOH (100 mL) and filtered to give 0.35g (78%) of 2 . mp 195 o C, decomp.; 1 H NMR (DMSO-d

Naphthalene Urea Derivatives for Anion Receptor: Effects of Substituents on Benzoate Binding