In Situ DLS/EPR/GC-MS Monitoring of the Catalytic Systems Based on Tungsten(VI) Hexachloride and Organo-Aluminum Compounds for Olefin Metathesis Reactions

• Published in: Theoretical and experimental chemistry 2023-11, Vol.59 (5), p.343-349
• Main Authors: Osmanova, S. N., Suleymanova, S. A., Zeynalova, T. G., Ismailov, E. H.
• Format: Article
• Language: English
• Subjects: Aluminum compounds; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Chlorine; Electron paramagnetic resonance; Ethane; Ethanol; Gas chromatography; Hyperfine structure; Mass spectrometry; Metathesis; Olefins; Photon correlation spectroscopy; Resonance scattering
• ISSN: 0040-5760; 1573-935X
• DOI: 10.1007/s11237-024-09793-w

Dynamic light scattering (DLS), electron paramagnetic resonance (EPR), and gas chromatography-mass spectrometry (GC-MS) methods were used to study interaction products of catalytic system components consisting of organoaluminum compounds (OAC), WCl6, and ethyl alcohol. Organic radicals (g = 2,0037, ∆H = 1,7mT) and W 5+ complexes (g z = 1,746, g y = 1,820, g x = 1,842, g 1 = 1,9957, g 2 = 1,9540, g 3 = 1,9465 at 77 K, and g 0 = 1.9583 at 300 K) with an additional hyperfine structure from two chlorine nuclei 35,37 Cl have been identified by the EPR method. The formation of such compounds is accompanied by ethane and ethylene release. It is shown that a Cl 6 /Et 3 Al (Et 2 AlCl)/EtOH-based catalytic system of olefin metathesis is a colloidal solution at the initial stages of the interaction of components. The further action of OAC leads to the formation of a molecular solution.