Although we did not detect any intermediates during the conversionof 7 to 8, the treatment of a cold solution of 7-K with 0.5 molar equivalents of the bulkier triisopropylsilyl triflate (TIPSOTf; OTf = SO3CF3)gave the formally iron(ii) diazenido complex 9, in which the N2 is singlysilylated while the phenyl group remains bound to the iron (Supplementary Fig. 55). The conversion of 7 to 9 is accompanied by a similar yield ofthe iron(ii) complex 5, which results from half of 7 acting as a reducingagent. Considering this stoichiometry, the formation of 9 occurs in 67%yield. The isolation of 9, in which the phenyl has not migrated, suggeststhat the initial silylation of the β position of the coordinated N2 in 7takes place before the migration of the aryl group. It is likely that thesecond silylation induces the aryl migration, because a recent study27reported the migration of H from an iron centre to the α position of adoubly silylated N2 group to form an iron disilylhydrazido complex.Accordingly, addition of excess trimethylsilyl triflate (Me3SiOTf) and
Although we did not detect any intermediates during the conversion<br>of 7 to 8, the treatment of a cold solution of 7-K with 0.5 molar equivalents of the bulkier triisopropylsilyl triflate (TIPSOTf; OTf = SO3CF3)<br>gave the formally iron(ii) diazenido complex 9, in which the N2 is singly<br>silylated while the phenyl group remains bound to the iron (Supplementary Fig. 55). The conversion of 7 to 9 is accompanied by a similar yield of<br>the iron(ii) complex 5, which results from half of 7 acting as a reducing<br>agent. Considering this stoichiometry, the formation of 9 occurs in 67%<br>yield. The isolation of 9, in which the phenyl has not migrated, suggests<br>that the initial silylation of the β position of the coordinated N2 in 7<br>takes place before the migration of the aryl group. It is likely that the<br>second silylation induces the aryl migration, because a recent study27<br>reported the migration of H from an iron centre to the α position of a<br>doubly silylated N2 group to form an iron disilylhydrazido complex.<br>Accordingly, addition of excess trimethylsilyl triflate (Me3SiOTf) and
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