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If you only heating this to 85°C your guaranteed to only get a maximum of 10% meth when done.. that’s nowhere near hot enough for a full conversion. you want to be closer to 120 to 140°C. You want the tiny silverfish bubbles .

I think you got your temperatures wrong or mixed up with red p/I2 synthesis. Heating this reaction up to 160 deg would be dangerous. Heating above 110°C causes hypophosphorous acid to undergo disproportionation to give phosphorous acid and phosphine gas which can and will spontaneously...