SEARCH Articles Figures Tables Ammonium salts synthesis Azacrown ether Azacrown ether-type quaternary ammonium Azacrown ethers, synthesis Azacrowns Azacrowns synthesis Ether salts Ether synthesis Quaternary ammonium salts Quaternary ammonium salts synthesis Quaternary salts Quaternary synthesis Salt, ethereal Salts synthesis Synthesis of Quaternary Ammonium Salts Synthesis of salts Synthesis of the azacrown ether Synthesis types