Is the Hoveyda–Grubbs Complex a Vinylogous Fischer??Type Carbene? Aromaticity??Controlled Activity of Ruthenium Metathesis Catalysts

…, A Szadkowska, A Makal, K Jarzembska…

Index: Barbasiewicz, Michal; Szadkowska, Anna; Makal, Anna; Jarzembska, Katarzyna; Wozniak, Krzysztof; Grela, Karol Chemistry - A European Journal, 2008 , vol. 14, # 30 p. 9330 - 9337

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Citation Number: 44

Abstract

Abstract Three naphthalene-based analogues (4 a–c) of the Hoveyda–Grubbs metathesis catalyst exhibited immense differences in reactivity. Systematic structural and spectroscopic studies revealed that the ruthenafurane ring present in all 2-isopropoxyarylidene chelates possesses some aromatic character, which inhibits catalyst activity. This aromatic stabilization within the chelate ring may be controlled by variation of the polycyclic core ...