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85030590997
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1H NMR spectrum using p-hydroxyacetophenone as an internal standard. The residue was purified by preparative TLC in the dark to give dihydrobenzofuran 2 and chromene 3.
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85030587463
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note
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We indeed observed photoracemization of the products 3b-k: for example, for 3k, 55% ee was diminished to 45% ee after 24 h upon irradiation with a (room) light.
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85030578837
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note
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Both stepwise addition of p-benzoquinone and the use of a combination of O2 with Cu co-catalyst as the oxidant were ineffective.
-
-
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48
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85030576470
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note
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3, 95% ee)}.
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