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Transition metal‐catalyzed [4+2+1] reactions of dienes (or diene derivatives such as vinylallenes), alkynes/alkenes, and CO (or carbenes) are expected to be the most straightforward approach to synthesize challenging seven‐membered ring compounds, but so far only limited successes have been realized. Here, an unexpected three‐component [4+2+1] reaction between two vinylallenes and CO was discovered...
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