I read in the disselkamp2008 - Copy.pdf paper "It is seen that both propanal and 1,3-dioxolane-2-ethyl-4-methyl concentrations are comparable during
the course of the reaction, and that they both achieve a maximum at 1.5 H2O2 equivalents.".
and "The combined yield at 1.5 equivalents H2O2 is computed to be 3.1%".
So even if this works the propanal yield is about 1,55% as both products are formed in equal amounts.
There must be a better way to make the propanal, maybe the tube furnace wasnt such a bad idea after all.
What about the method from Propionaldehyde wiki:
Propionaldehyde can be prepared by oxidizing 1-propanol with a mixture of sulfuric acid and potassium dichromate.
https://doi.org/10.15227%2Forgsyn.012.0064
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