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I also found a reduction with sodium or potassium borohydride without the use of copper chloride with only acetic acid.
General Procedure
Use the following amounts of reagents:- 1 mole eq. of any arylnitrostyrene
- 1,25 mol eq. potassium or sodiumborohydride1
- Approximately 5*wt. of the nitrostyrene in mL's of IPA (i.e. 10 g P2NP would require 50 mL IPA)
- 2/5 the vol of IPA used of dH2O
Once all of the substrate has been added, keep stirring the mixture for 30 mins. The colour of the mixture should be alot more pale than that of thenitrostyrene2. Add dilute (32-80%) acetic acid drop wise untill fizzing stops. Add solid non-iodized table salt while stirring heavily, untill no more dissolves. Suction filter the mixture, to remove any remaining salt and borates. Rinse the filter cake with a little fresh IPA. The IPA layer, containing the product will float on top of the water. Isolate the IPA layer, and discard the water.
At this point the reaction is over, and the IPA layer contains a product which is sufficiently pure for a CTH, Zn/Formate, SnCl2 nitro reduction or whatever your preference might be. So simply use this IPA direcly.