(R)-binaphthoxy diiodide lanthanides

The synthesis and characterization of novel enantiopure binaphthoxy-diiodo lanthanides [(R)-2-( 1-naphthol)-l'-naphthoxide)LnI(2)(THF3),] (Ln = Sm (4a), Yb (4b), La (4c)) are described. These complexes have been prepared by reacting the mono potassium salt of (R)-binaphthol with the corresponding lanthanide triiodides and were characterized by elemental analysis, IR and NMR spectroscopies. Recrystallization of 4c from THF-hexane led to monocrystals of [(R)-2-(1-naphthol)-1'-naphthoxide)]-diiodolanthane-tetrakistetrahydrofurane] (4c*). Complex 4c* crystallizes in the orthorhombic space group. P2(1)2(1)2(1) with cell parameters a = 13.086(1) Angstrom, b = 15.496(1) Angstrom, c = 18.854(1) Angstrom, V = 3823.2(6) Angstrom(3), and Z = 4. (C) 1999 Elsevier Science S.A. All rights reserved.