Unsaturated ketones enones photocycloaddition and photorearrangement

Case Study 6.12 Organic synthesis - construction of the AB-ring core of paclitaxel 

Photochemistry of cross-conjugated cyclohexa-2,5-diones has historically served to explain the mechanism of some primary photochemical processes774 and later it has been successfully utilized in organic synthesis. In general, bicyclo[3.1.0]hex-3-en-2- 

Explain the following concepts and keywords photostationary state Rydberg state NEER principle bicycle-pedal mechanism phototransduction phototherapy photochemical deracemization enantiodifferentiating photosensitization photochromism di-Tt-methane rearrangement asymmetric photochemical synthesis single-crystal-to-single-crystal photochemistry photochemotherapy rule of five. 

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