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(a) Application of the Norrish–Yang photocyclization of α-diketones (I) using daylight to diastereoselectively generate 2-hydroxy-cyclobutanone-based spiro-trans-decalin (II) via a conformationally controlled hydrogen-bonding-promoted 1,5-H-atom transfer through the 1,4-diradical intermediate II. (b) trans-Decalin-based natural products bearing C4, C9, and C10 stereogenic centers.
