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The site‐selective and regioselective allylation of 2‐substituted indoles was performed by using a ruthenium(IV) precatalyst containing a phosphine–sulfonate chelate. Mono‐, di‐, and triallylated indoles were selectively obtained depending on the reaction conditions with the formation of water as the only byproduct. The preparation of 3‐oxindole derivatives was then successfully performed owing to...
Ruthenium residues are often difficult to remove after a metathesis step, especially by routine chromatography, and their retention can cause subsequent problems such as additional but unwanted metatheses, alkene migrations or metal complex formation. This review aims to summarize methods developed since 2003 to address this drawback. These are either chemical methods, such as oxidation or, more commonly,...
Ruthenium comes to its senses: Determining how effectively ruthenium residues are removed from olefin metathesis reactions calls for an alternative evaluation method to ICP‐MS. A fluorescent chemosensor for ruthenium has been developed based on an alkene oxidation reaction (see figure). This fluorescence method has a good selectivity as well as an excellent sensitivity and a 0.32 ppb detection limit...
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