UV irradiation of latent sulfur-chelated ruthenium olefin metathesis precatalysts produced a cis-dichloro−trans-dichloro photoisomerization. The enhanced activity of the trans isomer, when aromatic substituents were attached to the sulfur chelating atom, induced several metathesis reactions, including ROMP, at room temperature.
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Ben-Asuly et al. (2009) studied this question.
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