In order to verify that the whole process is indeed cyclic, under the same conditions, added toluene was used instead of benzene. The analysis of the organic reaction products after adding Me3SiBr twice showed that the yield of N(SiMe3)3 was 163%, the yield of PhN(SiMe3)2 was 62%, and the yield of (tolyl)N(SiMe3)2 was 16% (meta and para isomers).
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