Synthesis and structural characterization of zirconium complexes containing aminodiolate ligands and their use as Lewis acid catalysts
| Autor: | Roland A. L. Gendron, David J. Berg, Shao Pengcheng Patrick |
|---|---|
| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Canadian Journal of Chemistry. 78:255-264 |
| ISSN: | 1480-3291 0008-4042 |
| DOI: | 10.1139/v00-001 |
| Popis: | A series of aminodiols RN(CH2CH2C(OH)Rprime2)2 (R, Rprime = Me, Me 4; Me, Ph 5; tert-butyl, Me 6; tert-Bu, Ph 7; (S)-PhCH(Me), Me 8) were prepared by the Michael addition of a primary amine to methyl acrylate followed by reaction of the resulting aminodiester with excess methyl or phenyl lithium. Reaction of two equivalents of the aminodiols 4-8 with tetrabenzylzirconium afforded the zirconium bis(aminodiolates) 10-14 in excellent yield. Complex 11 (R, Rprime = Me, Ph) adopts a cis, fac-octahedral geometry in solution and in the solid state. Complexes 10-14 are fluxional in solution by NMR spectroscopy: small substituents at nitrogen and large substituents at the alkoxide carbons slow the rate of exchange. The chiral complex 14 functions as a Lewis acid catalyst in the nitroaldol (Henry) reaction and the oxidation of geraniol by tert-butyl hydroperoxide with modest enantioselectivities (30 and 46% enantiomeric excess (ee), respectively).Key words: diol, Michael addition, zirconium, synthesis, structure, fluxional, alkoxide, Lewis acid, catalysis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|