The Vespiary
The Hive => Chemicals & Equipment => Topic started by: majic22 on February 06, 2003, 12:04:00 AM
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In the "Wacker KRV - Ketone's Guide to Wacker-powered Production of MDP2P using methanol" synth, it says
"In this case, we'll be using cupric chloride (CuCl2). Copper chloride (CuCl) cannot be used in the procedure outlined here as it does not dissolve in methanol (MeOH) or ethanol (EtOH) and thus does not form the required complex."
Swims question being thus, Is CuCl2-2H20 interchangeable with the required chem in the synth? since its the same thing, only with two H20 molecules attached (dihydrate). thanks
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You can use the cucl2.h20 in the o2 wacker. The only difference is you don't have to add and dh2o.
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ok cool here is the exact quote from the synth.
If you are using anhydrous solvent you should add 1% (2.5mL) dH2O to the reaction. This reaction needs a bit of water to perform. If you're using anhydrous CuCl2 and not CuCl2.2H2O, add another 2.5mL of dH2O.
Let swim make sure he understands this correctly,
the second part of that sentence swim already knows is talking about the CuCl2.H20 and he understands he doesnt have to add water.... but
the first part of that sentence (talking about annhydrous solvent) is this part referring to the methanol? if so, can someone tell swim whether the methanol in the little yellow bottle from X-Mart is annhydrous or not?
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The little yellow bottles contain trace amounts of water. They are not anhydrous. LAb grade meoh can be purchased anhydrous from a chem supplier.
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You don't need to add any water. Run as is without water and save yourself about 5 addition hours of running time. No sense in having your operation running longer increasing your risk factor.
Those bottles have up to 2% water. Most MeOH including anhydrous lab methanol has ~0.3% water. Don't add water. The only thing that will do is require you to run it longer or cool the reaction temp somewhat.