SOMC-Designed Silica Supported Tungsten Oxo Imidazolin-2-iminato Methyl Precatalyst for Olefin Metathesis Reactions
Hamieh, Ali Imad Ali
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AbstractSynthesis, structure, and olefin metathesis activity of a surface complex [(≡Si-O-)W(═O)(CH3)2-ImDippN] (4) (ImDipp = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-iminato) supported on silica by a surface organometallic chemistry (SOMC) approach are reported. The reaction of N-silylated 2-iminoimidazoline with tungsten(VI) oxytetrachloride generated the tungsten oxo imidazolin-2-iminato chloride complex [ImDippNW(═O)Cl3] (2). This was grafted on partially dehydroxylated silica pretreated at 700 °C (SiO2-700) to afford a well-defined monopodal surface complex [(≡Si-O-)W(═O)Cl2-ImDippN] (3). 3 underwent alkylation by ZnMe2 to produce [(≡Si-O-)W(═O)(CH3)2-ImDippN] (4). The alkylated surface complex was thoroughly characterized by solid-state NMR, elemental microanalysis, Raman, FT-IR spectroscopies, and XAS analysis. 4 proved to be an active precatalyst for self-metathesis of terminal olefins such as propylene and 1-hexene.
CitationQureshi ZS, Hamieh A, Barman S, Maity N, Samantaray MK, et al. (2017) SOMC-Designed Silica Supported Tungsten Oxo Imidazolin-2-iminato Methyl Precatalyst for Olefin Metathesis Reactions. Inorganic Chemistry 56: 861–871. Available: http://dx.doi.org/10.1021/acs.inorgchem.6b02424.
SponsorsThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)
Is Supplemented ByQureshi, Z. S., Hamieh, A., Barman, S., Maity, N., Samantaray, M. K., Ould-Chikh, S., … Basset, J.-M. (2017). CCDC 1501262: Experimental Crystal Structure Determination [Data set]. Cambridge Crystallographic Data Centre. https://doi.org/10.5517/ccdc.csd.cc1md5t0