paul van den bergen wrote: >Can some one direct me to a definitive answer on the transesterification >mechanism and in particular the role and nature of the catalyst? > > > > > Paul, There isn't a true catalyst in the reaction. The sodium methoxide which is added is partially used up in the reaction. A true catalyst goes in a cycle and is left to be used repeatedly. I could possibly get my sister [BS Chemistry] to write about it. Try searching google.com for details, I'm sure someone has a web page about the reaction.
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