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Kolekcje
Inne
Synthesis and structural characterization of magnesium and titanium siloxanes.
Autorzy
Rok wydania
2002
Czasopismo
Numer woluminu
334
Strony
159-164
DOI
10.1016/S0020-1693(02)00744-2
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Dimeric magnesium complex with siloxane OSiPh 3 ligands have been synthesised with the aim of investigating magnesium sites able to bind TiX 4 (X=Cl, OR), of the type necessary for the formation of the active centres in polymerisation catalysts. The magnesium compound [Mg 2 (μ-OSiPh 3 ) 2 (OSiPh 3 ) 2 (THF) 2 ] (1, 76%) was prepared by reaction of [Mg 4 (thffo) 8 ] (thffo-H=tetrahydrofurfuryl alcohol) with Ph 3 SiOH in tetrahydrofurane (THF). The addition of TiCl 4 to 1 in a 2:1 molar ratio results in the formation of [TiCl 2 (OSiPh 3 ) 2 (THF) 2 ].2THF (2, 50.5%). The reaction of 1 with 4 equiv. of cis-[TiCl 2 (η 2 -maltolato) 2 ] (maltolato=(O,O)-3-oxy-2-methyl-pyran-4-onato) in CH 2 Cl 2 gave compound [TiCl(OSiPh 3 )(η 2 -maltolato) 2 ].THF (3, 72%). Straightforward chloride replacement reaction in 3 by use of Li t Bu and Ph 3 SiOH results in the formation of species [Ti( t Bu)(OSiPh 3 )(η 2 -maltolato) 2 ] (4, 63%) and [Ti(OSiPh 3 ) 2 (η 2 -maltolato) 2 ] (5, 91%), respectively. The molecular structures of compounds 2 and 3 have been determined by X-ray structure analysis.
Słowa kluczowe
Magnesium compounds, Titanium complexes, Siloxanes, Polymerisation
Adres publiczny
https://doi.org/10.1016/S0020-1693(02)00744-2
Strona internetowa wydawcy
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