As decoordination of the N2 ligand in 5 is favored with temperature, we hypothesized that the formation of 3-H might arise from the reaction of in situ liberated 2 with H2. We reasoned that lower temperatures should be beneficial for higher conversions into 6 vs. 3-H. Although the reaction appeared kinetically blocked below 0 °C, full conversion was observed upon stirring a toluene or pentane suspension of 5 under H2 atmosphere over 1-5 days at 0 °C or room temperature. Under these conditions, 6 was consistently formed in 20-32% NMR yields (Figures S22-23).