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5-exo-dig 6-endo-dig
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2,3-sigmatropic rearrangement
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C
or
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Indene synthesis:
cyclopropanation:
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oxidation/cyclization/migration
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)
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a)
b) supported by DFT calculations
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1) more atom-economic and greener oxidants;
2) a broad range of nucleophiles as trapping partners;
3) More details of the mechanism;
4) lowering the catalyst loading
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