SEARCH Articles Figures Tables 18-crown synthesis 2- -1,3-phenylene-16-crown A aromatic A, receptor A-Aromaticity Aromatic deficiency Aromatic synthesis Bi Deficiency Bis aromatic Bis phenylenes Bis synthesis Bis-p-phenylene Electron aromatic Electron deficiency Electron deficient synthesis N aromatization N receptor N-Aromatics P Electrons P-phenylene Phenylene synthesis Receptors for