A. Khatyr et R. Ziessel, Sequential synthesis of rigid multi-bipyridine ligands bearing diethynyl/phenyl solubilizing fragments, TETRAHEDR L, 41(20), 2000, pp. 3837-3841
Reliable and practical synthetic routes for the construction of multitopic
bipyridine ligands are presented. The first series contains the chelating f
ragments connected via an ethynyl function and the second series is built f
rom an alternation of ethynyl/phenyl/bipyridine modules. The synthetic prot
ocol is based on sequential Pd-promoted cross-coupling reactions between se
lected bis-bpy or ethynyl/phenyl/bpy intermediates of increasing size. The
ligands bearing functionalized 1,4-diethynyl-2,5-di(dodecyloxy)benzene subu
nits are soluble in chlorinated solvents. (C) 2000 Elsevier Science Ltd. Al
l rights reserved.