The experiment \"A Solventless hydrogenation of unsaturated waters using 0.5% Pd

Question

The experiment "A Solventless hydrogenation of unsaturated waters using 0.5% Pd/Al(O)OH" was done. However, hexane was used during the filtration. The experiment title claims that this reaction is green because the reaction is solventless. Do you think the fact we used hexane invalidates this claim? How can we make this experiment more green? The experiment "A Solventless hydrogenation of unsaturated waters using 0.5% Pd/Al(O)OH" was done. However, hexane was used during the filtration. The experiment title claims that this reaction is green because the reaction is solventless. Do you think the fact we used hexane invalidates this claim? How can we make this experiment more green?

Explanation / Answer

At the end of this reaction a solid mixture is formed which consist of the product (ester) and the catalyst. When hexnae is added to it, the saturated ester dissoves in it while the catalyst does not and it flotes over the solution. This heterogeneous mixture is then filtered to get the catalyst. The hexane solution is evaporated to get the product. Thus the net reaction is solventless.

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In order to make the reaction more green, a different solvent has to be used. For example instead of hexane , heptane will be a preferred solvent.

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