Special Topic 6.4 Photoproduction of vitamin

Case Study 6.3 Mechanistic photochemistry - previtamin D photochemistry 

Vitamin D3 is naturally synthesized in human skin by a spontaneous thermal antarafacial hydrogen [l,7]-sigmatropic shift in previtamin D3, which is produced from 64 upon solar UVB irradiation in the first step.621 

Experimental details 620 Sample solutions of previtamin D3 (2 x 10 3 m) in a 1 cm pathlength UV cell were purged with nitrogen and irradiated using a pulsed UV dye laser at 300 nm (Special Topic 3.1), containing Rhodamine 6G as a sensitizer in methanol or a methanol water mixture (1 1, v/v). After irradiation, an aliquot of the sample solution was analysed by HPLC. 

Case Study 6.4 Optical information storage - photochromic diarylethenes 

Case Study 6.5 Organic synthesis - a stepurane derivative 

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