Rhodium, would you by any chance have the solubilities of the components of this reaction in various solvents? I wonder if there is a solvent that the imine is soluble in that the others aren't.
i.e. let the rxn reach equillibrium, extract w/ mystery solvent, removing some of the imine from sol., let rxn. reach equilibrium again, extract again, repeat till satisfied.
or perhaps something that would crash the imine out of the water, but nothing else? that would shift the reaction towards the imine by constantly removing it from the solution?
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