Preparative VIS‐Laser Photochemistry. Qinghaosu‐Type 1,2,4‐Trioxanes by Molecular Oxygen Trapping of Paterno‐Buechi Triplet 1,4‐Diradicals Derived from the Bicyclic Enol Lactones δ1,6‐ and δ1,10‐2‐Oxabicyclo(4.4.0)decen‐2‐one and p‐Benzoquinone.