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Reaction between t-butylmagnesium chloride and 9,10-phenanthraquinone takes an unusual course involving 1,6-addition. This leads successively to products based on 3-t-butyl- and 3,6-di-t-butyl-9,10-phenanthraquinone.

A detailed study has been made of the reactions of di-p-nitrobenzoyl peroxide with p-dichlorobenzene, naphthalene, and nitrobenzene. The reaction with p-dichlorobenzene gives much higher yields of substituted diphenyls, than the corresponding reaction with benzoyl peroxide. The stoicheiometry of the reaction with naphthalene is different from that of the benzoyl peroxide-naphthalene system. Possible mechanisms of the formation of dinaphthyls are discussed.

Reactions of a number of mixed peroxides and mixtures of peroxides, with benzene and with nitrobenzene, have been studied. The complex nature of the reactions prevents quantitative comparison of radicals, but some general features are discussed, particularly the relative simplicity of the products obtained from p-nitro-substituted peroxides and/or nitrobenzene.

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