期刊
INORGANICA CHIMICA ACTA
卷 361, 期 11, 页码 3309-3314出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2007.12.001
关键词
dirhodium; dirhodium carboxamidate; glycoluril; cyclopropanation; catalysis
1,6-Bis-(N-benzyl)-diphenylglycoluril (1,6-BPGlyc) was used as a ligand in the synthesis of a dinuclear rhodium(II) paddlewheel complex. The ligand exchange reaction from Rh-2(OAc)(4) was remarkably selective for the formation of Rh(1,6-BPGlyc)(2)(OAc)(2) with a cis(1,3) ligand arrangement in 46% isolated yield. The bis-substitution pattern and diastereoselective ligand exchange is attributed to the steric bulk of the glycoluril backbone that prevents further ligand substitution. Rh-2(1,6-BPGlyc)(2)(OAc)(2) catalyzes cyclopropanation reactions via decomposition of diazoacetates with reactivities and selectivities that were comparable to those of dirhodium(II) tetrakis-mu-carboxamidates. (C) 2007 Elsevier B.V. All rights reserved.
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