methylene iodide (diiodomethane) synthesis (safrole precursor)

fidelis

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honestly i'm not exactly sure how this chemical is used in a safrole synth but a link containing a diiodomethane synth was found in a safrole synthesizing thread on the vespiary, so here u guys go ^^; hope someone can find use for this


Methylene chloride (30 grams) is mixed with sodium iodide (120 grams) and warm acetone (100 ml) and heated in a sodawater bottle for ten hours; the bottle is then re-corked and the heating continued for a further ten hours. After standing overnight, the acetone solution is decanted from the sodium chloride, the latter washed with acetone, and the acetone distilled off; water is then added and the crude methylene iodide extracted with ether. The ethereal solution contains iodine and is washed with water containing sodium hydrogen sulphite, dried, and the ether distilled off. The residue is then fractionated under reduced pressure, when, after a little methylene chloro-iodide has passed over, methylene iodide distills at about 150°C at 300 mmHg, the yield being at least 60%. If the recovered acetone, containing methylene chloride, is employed in a subsequent operation, the yield is about 10% higher.
 

mewnmewamine

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its used for methylenation also this synthesis DOES NOT WORK the finkelstein just procedes too slow check this scimad thread i also have experience with this myself i however realised early on that dcm can be used as is
user : chemoleo
Original ref
Resolution of dl-trans cyclopentane 1,3 -dicarboxylic acid. William Henry Perkin junior, Harold Archibald Scarborough. Chemical Society Transactions, volume 119, 1921, pages 1400 -1408
 
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