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Topic: salen-type schiff bases  (Read 4806 times)

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salen-type schiff bases
« on: May 20, 2004, 05:09:08 AM »
Anyone know a detailed prep for the schiff base ligands of 2,6-diformyl-4-methylphenol and diamines? Most just say reflux in ethanol only this leads to insoluble and/or sticky side products. Thanks for any help


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Re:salen-type schiff bases
« Reply #1 on: June 03, 2004, 12:32:10 PM »
Hallo friend,

So what u get as a sticky material may actually be either a polymer or a macrocycle (insoluble in EtOH; but soluble in CH2Cl2, CHCl3...). This is a general way to synthesis these materials.

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Re:salen-type schiff bases
« Reply #2 on: July 20, 2004, 02:47:31 PM »
I've made Schiff base, salen type ligands by the "refluxing ethanol" method before and it worked fine, but I was using aromatics with only one aldehyde.  That second aldehyde on your aromatic portion may be leading to polymerization, as suggested above.  I don't think that I encountered any gummy residue, the reaction was pretty clean.

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