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- W1996075346 abstract "Compounds of the type trans-W(OAr)4Cl2 (OAr = phenoxide or substituted phenoxide) in combination with EtAlCl2 or Et3Al2Cl3 are active catalysts for metathesis of alkenes. The maximum rate of metathesis occurs at a W:Al ratio of 1:6. These systems give rise to productive metathesis of terminal alkenes, albeit at lower rates than for terminal alkenes. Slow isomerisation of the terminal alkene occurs in parallel with metathesis and cross-metathesis of 1-alkenes and 2-alkenes (produced by isomerisation) is observed. Comparison of rates of metathesis of 2-pentene catalysed by W(OAr)4-Cl2 shows that electron-withdrawing groups in the 4-position of the phenoxide cause considerable increase in activity. Over a limited range of substituents (Cl, Br, H, Me, OMe) a linear Hammett-relationship is observed. The presence of CH3 substituents in the 2- and 6- position on the aromatic ring also leads to considerable rate enhancement." @default.
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- W1996075346 date "1982-04-01" @default.
- W1996075346 modified "2023-09-27" @default.
- W1996075346 title "Tungsten phenoxides as metathesis catalysts" @default.
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- W1996075346 doi "https://doi.org/10.1016/0304-5102(82)80009-6" @default.
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