jenijjun - 22-7-2021 at 04:54
I've stumbled upon an interesting paper[1] using chemical manganese dioxide (CMD) instead of activated manganese dioxide for mild alcohol oxidation.
I'm looking for a route on how to synthesize active CMD. Could this work?
Mn2O7 + 3 MnO → 5 MnO2
or
2 KMnO4 + 3 MnSO4 + 2 H2O→ 5 MnO2 + K2SO4 + 2 H2SO4
Alternatively, I've found a procedure talking about potassium permanganate and activated carbon[2] yielding activated manganese dioxide.
Another procedure, activated manganese dioxide, starts with manganous sulfate, sodium hydroxide, potassium permanganate and is then activated by water
removal using azeotropic distillation with benzene[3].
My goal is primary alcohol oxidation to an aldehyde. Does anyone have any experience with this or some tips?
refs:
[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6147282/
[2] https://pubs.acs.org/doi/10.1021/jo00836a091
[3] https://pubs.acs.org/doi/abs/10.1021/jo01258a106
[Edited on 22-7-2021 by jenijjun]
Bedlasky - 22-7-2021 at 13:45
I am not an expert on organics, but MnO2 made from KMnO4 is pretty reactive, so I think that this is good precursor for your activated manganese
dioxide. This higher reactivity is caused by presence of alkali metal ion in the crystal lattice of MnO2.