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. Author manuscript; available in PMC: 2020 Jun 26.
Published in final edited form as: J Am Chem Soc. 2019 Jun 13;141(25):10016–10032. doi: 10.1021/jacs.9b03890

Table 2.

Stoichiometric Experiments using Oxochromium(V) Salen and μ-Oxochromium-Salen Complexes.

graphic file with name nihms-1032881-t0030.jpg
entry [Cr] (equiv) temp (°C) time (h) Conversionb
1 Cr [V] (0.1) 25 3 10 %
2 Cr [V] (0.5) 25 1 38 %
3 Cr [V] (0.5) + Cr [III] (1.0) 25 24 0 %
4a Cr [V] (0.5) + Cr [III] (1.0) 80 24 12 %
a

The indicated amount of Cr [V] and Cr [III] were combined and heated at 80 °C for 2 h. This mixture was cooled to 25 °C and the phenol substrates were then added and stirred for the indicated time and temperature.

b

Determined by 1H NMR spectroscopy.