Conclusion The lipophilic diammonium cation 3 is a very efficient and selective phasetransfer reagent of nucleotide anions. Two cationic centers are separated by 2.4 8, which is complementary to vicinal or geminate dianions of nucleotide phosphates. Nucleotide binding decreased in the order triphosphate> diphosphate> monophosphate, and their selectivity was high as exemplified by 45 for ADPIAMP and 7500 for ATPIAMP. ...