One of the most thoroughly studied photochemical California reactions is the photoreduction of an aromatic ketone in 2-propanol or other secondary alcohol(l).
On the yield of intermediates formed in the photoreduction of benzophenone
โ Scribed by C. Viltres Costa; M.A. Grela; M.S. Churio
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 895 KB
- Volume
- 99
- Category
- Article
- ISSN
- 1010-6030
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It is well known l-4 that p-aminobenzophenones are photoreduced very alcohols, while in less polar solvents such 8s cyclohexane and triethylamine,
Ultraviolet irradiation of benzophenone in 2-proPano12 leads to the radicals3'4 (c,H,),&0H I and (cH,&~H II, (C,H,)aC=O\*+ (CHs)aCHOH --i, (C&)&OH + (CHs)ztOH (I)
Benzophenone triplets (3BP\*) react very effectively with the cations of crystal violet (CV+), methylene blue (MB\*) and phenosafranine (PS') in argon-saturated acetonitrile solution at 23 "C: k, values (in M-' s-l) are (3 rt 1) x 10" (CV+), (7 f 1) X 1CP (MB+) and (5 \* 1) x 10' (PS+). The results