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β‐Diketiminatoytterbium aryloxides: synthesis, structural characterization, and catalytic activity for addition of amines to carbodiimides
Author(s) -
Cai Lingxia,
Yao Yingming,
Xue Mingqiang,
Zhang Yong,
Shen Qi
Publication year - 2013
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.2996
Subject(s) - chemistry , steric effects , tetrahydrofuran , molar ratio , catalysis , medicinal chemistry , ligand (biochemistry) , crystal structure , stoichiometry , ytterbium , stereochemistry , organic chemistry , biochemistry , physics , receptor , optoelectronics , doping , solvent
The steric effect of an aryloxido group on the synthesis and molecular structures of ytterbium aryloxides supported by β‐diketiminato ligand L (L = [N(2,6‐Me 2 C 6 H 3 )C(Me)] 2 CH − ) is reported. Reactions of β‐diketiminatoytterbium dichloride, LYbCl 2 (THF) 2 , with NaOAr 1 in THF (Ar 1 = [2,6‐ t Bu 2 ‐4‐MeC 6 H 2 ], THF = tetrahydrofuran) at 60°C gave the corresponding ytterbium complexes LYb(OAr 1 )Cl(THF) ( 1 ) and LYb(OAr 1 ) 2 (1), depending on the molar ratio of dichloride to sodium aryloxide, respectively, while the same reactions with NaOAr 2 and NaOAr 3 (Ar 2 = [2,6‐ i Pr 2 C 6 H 3 ], Ar 3 = [2,6‐Me 2 C 6 H 3 ]) in 1:1 or 1:2 molar ratio in THF afforded only bisaryloxide complexes LYb(OAr 2 ) 2 (THF) (1) and LYb(OAr 3 ) 2 (THF) ( 4 ) in good yields, respectively. Complexes 1 , 2 , 3 , 4 were fully characterized, including X‐ray crystal structure analyses. All the complexes are efficient pre‐catalysts for the catalytic addition of amines to carbodiimides giving guanidines. Copyright © 2013 John Wiley & Sons, Ltd.