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A homogeneous ruthenium–carbene complex was tagged with a light-responding nitrobenzospiropyran group to control its solubility through reversible conversion between its neutral (lipophilic) and ionic (lipophobic) states using light irradiation (see scheme; Mes=mesityl). This tagged complex has significant catalytic activity in ring-closing metathesis reactions and was recycled several times.
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Liu et al. (2010) studied this question.
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