| http://www.w3.org/ns/prov#value | - ub.2 and R.sub.3having the meanings given in the foregoing.The oxidising agents used can be compounds known per se, e.g. inorganic or organic peroxides, such as hydrogen peroxide, potassium peroxydisulphate, tert-butylhydroperoxide, di-tert-butyl peroxide, peracetic acid, trifluoroperacetic acid, benzoylperoxide, m-chloroperbenzoic acid, perphthalic acid, cumenehydroperoxide, tert-butylperbenzoate
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