%0 Journal Article %A Hani Amouri %A Yvon Besace %A Jacqueline Vaissermann %T Synthesis, NMR and properties of a novel crown ether dimer: X-ray molecular structure of bis(2, 5-dimethoxy-4,6-dimethyl-1,3-xylyl)-18-crown-4 %J Comptes Rendus. Chimie %D 2003 %P 193-197 %V 6 %N 2 %I Elsevier %R 10.1016/S1631-0748(03)00037-7 %G en %F CRCHIM_2003__6_2_193_0