High Resolution Image Download MS PowerPoint Slide A tandem catalytic reaction has been developed as part of a process to discover tungsten-based olefin metathesis catalysts that have a strong preference for terminal olefins over cis or trans internal isomers in olefin metathesis. This tandem isomerization/terminal olefin metathesis reaction (ISOMET) converts C n trans internal olefins into C 2 n –2 cis olefins and ethylene. This reaction is made possible with Ru-based “alkene zipper” catalysts, which selectively isomerize trans olefins to an equilibrium mixture of trans and terminal olefins, plus tungsten-based metathesis catalysts that react relatively selectively with terminal olefins to give Z homocoupled products. The most effective catalysts are W(NAr)(C 3 H 6 )(pyr)(OHIPT) (Ar = 2,6-diisopropylphenyl; pyr = pyrrolide; OHIPT = O-2,6-(2,4,6- i -Pr 3 C 6 H 2 ) 2 C 6 H 3 ) and various [CpRu(P–N)(MeCN)]X (X – = [B(3,5-(CF 3 ) 2 C 6 H 3 ) 4 ] –, PF 6 –, B(C 6 F 5 ) 4 – ) isomerization catalysts.
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Dobereiner et al. (2014) studied this question.
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