An unprecedented benzylic C−H functionalization of methyl arenes across unactivated alkenes is presented. In the presence of MnCl 2 •4H 2 O and di-tert-butyl peroxide, N-allyl anilines underwent benzylation/cyclization cascade to give benzylated indolines, which are a previously unmet synthetic goal. This protocol features simple operation, broad substrate scope, and great exo selectivity.

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Commercially available dip strips based on peroxidase technology are widely used to semiquantitatively determine the peroxide concentration in peroxidizable solvents. However, on the basis of the results of our study, the method can only qualitatively respond to limited types of peroxides; it also responds to other oxidants, such as NaClO. Therefore, test results obtained from dip strips should be used for reference only. Differential scanning calorimetry is recommended as a more reliable and direct method to assess decomposition risks.