Details

Autor(en) / Beteiligte

• Panchenko, Valentina N.
• Babushkin, Dmitry E.
• Prikhod’ko, Sergey A.
• Barabanov, Artem A.
• Zakharov, Vladimir A.

Titel

Study of the interaction of diethyl 2,3-diisobutyl succinate (DIBS) with magnesium dichloride and the stereoisomeric configuration of DIBS within titanium-magnesium catalysts of propylene polymerization

Ist Teil von

• Applied catalysis. A, General, 2024-06, Vol.680, Article 119741

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• It was found by chromatography and 13C NMR spectroscopy that diethyl 2,3-diisobutyl succinate (DIBS), which is used as a stereoregulating electron donor in titanium–magnesium catalysts, exists as rac and meso stereoisomers. Their molecular structure was calculated using the DFT method. It was ascertained that mainly rac-DIBS is anchored to the surface of MgCl2. Subsequent interaction between the MgCl2/DIBS sample and TiCl4 leads to further removal of meso-DIBS. Titanium–magnesium catalysts of composition MgCl2/DIBS/TiCl4 prepared by different procedures contain 85–91% rac-DIBS. The IR spectroscopy data on the stereoisomeric configuration of DIBS in MgCl2/DIBS samples and titanium–magnesium catalysts MgCl2/DIBS/TiCl4 prepared by different procedures and the data on propylene polymerization over these catalysts are presented. [Display omitted] •Titanium-magnesium catalysts with diethyl 2,3-diisobutyl succinate have been studied•Mainly rac-stereoisomer (85–91%) is anchored to the surface of MgCl2 in catalysts•Succinate is anchored preferentially to pentacoordinated Mg ions on MgCl2 surface