Alcoholysis of Aluminum Alkyls Supported by Bulky Phenoxide Ligands: Synthesis, Characterization, and ϵ-Caprolactone Polymerization Activity of Two Dimeric Aluminum Isopropoxides
✍ Scribed by Insa Taden; Hak-Chul Kang; Werner Massa; Thomas P. Spaniol; Jun Okuda
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 284 KB
- Volume
- 2000
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Reaction of trialkylaluminum Al 2 R 6 (R = Me, Et) with 2,2'methylenebis(6-tert-butyl-4-methylphenol) (mbmpH 2 ) gives the dimeric mono(alkyl) complex [Al(mbmp)R] 2 with bridging oxygen atoms. Reaction of [Al(mbmp)R] 2 with one equiv. of 2-propanol results in the formation of the dimeric isopropoxide [Al(mbmp)(µ-OiPr)] 2 . Single-crystal X-ray analysis shows a C 2h -symmetric structure with a planar Al 2 O 2 core.
Monomeric methylbis(2,6-di-tert-butyl-4-methylphenolato)aluminum, AlMe(OC 6 H 2 -2,6-tBu 2 -4-Me) 2 (MAD), was found to react with one equiv. of 2-propanol to give a dimeric isopropoxide [AlMe(OC 6 H 2 -2,6-tBu 2 -4-Me)(µ-OiPr)] 2 in which the bulky phenolate, instead of the methyl group, has been displaced. According to the single-crystal X-