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How much methylamine would one use for 1kg of bk ??
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262 g is absolute minimum, realistically 280 g - 300 g.
Thats 700 g - 750 g of a 40% MeNH2 solution in water, look at the 4-MMC synth which uses EtOAc for the workup/crystallisation as it won't work as here described for the water.
Thats 700 g - 750 g of a 40% MeNH2 solution in water, look at the 4-MMC synth which uses EtOAc for the workup/crystallisation as it won't work as here described for the water.