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1997, 93,2269. 27. F. Bosca, M. A. Miranda, G. Carganico and D. Mauleon, Photochem.

These are supposed to absorb W light and degrade it to heat avoiding skin photosensitisation. 174 However, most of these compounds do show some photoreactivity and this requires careful evaluation before their use as active ingredients in sunscreens is accepted. The subject is discussed by J. M. Allen in this book (p. 1 Antibacterials: SulfaDrugs. The photochemistry of sulfa drugs has been extensively investigated. 176 With N-[2-(5-methylisoxazolyl)] sulfanylamide, sulfmethoxazole (179), rearrangement to the corresponding 245methyloxazolyl) derivative (1 80) also takes place (Scheme 52).

284 In the present section two key points concerning the dependence of photochemical reaction on the conditions under which drugs are prepared or used are briefly addressed. These are solid state vs solution and anaerobic vs aerobic conditions. 1 Photoreactions in the Solid State. The different chemistry occurring by irradiating a drug in the solid state vs the solution for most drugs (and in general most molecules) has been often mentioned in Sec. g. Schemes 13, 15, 28, 42). According to the different light penetration in the crystal, two different situations may arise.

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