##STR1## The invention concerns a method for preparing quinoline-5,8-diones of formula (I) wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in claim 1, by light-induced oxygenation of a 8-hydroxyquinoline.

## ## STR1 Вымысел относится метод для подготовлять quinoline-5,8-diones формулы (I) при котором R.sub.1, R.sub.2 и R.sub.3 как определено в заявке 1, light-induced оксигенацией 8-hydroxyquinoline.

 
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