The invention relates to a method for carrying out photochemical and thermochemical solar syntheses by means of flat-bed solar light collectors without devices for focusing the sunlight. The method is particularly well suited for producing flavors, aromas and complex thereof. The flat-bed solar light collector is suitable especially for producing steroids and derivatives thereof. It can further be used for the photooxidation (photooxygenation) of terpene olefins and therefore for the synthesis of fragrants such as rose oxide, myrtenol and myrtenal which are of industrial interest. The solar collector is also suitable for photochemical addition reactions and rearrangements.
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