Norrish Type I Cleavage of 9-Oxabicyclo[3.3.1]nonan-3-one : A Straightforward Synthesis of (±)-(cis-6-Methyletrahydropyran-2-yl)acetic Acid, a Constituent... The photo-reaction of 9-oxabicyclo[3.3.1]nonan-3-one (2) was investigated. Upon irradiation in methanol, the ketone (2) ...