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+ Catalysis
+ Amines
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Larry Walden

What is the product when cyclohexanone reacts with morpholine?

Cameron J. Smith  Follow

TsOH is a relatively strong organic acid (Source: Wikipedia). It is used to protonate the carbonyl oxygen and make the carbon atom more electrophilic, thus facilitating nucleophilic addition of the amine.

Benzene acts as a solvent in this case. It can dissolve the less polar cyclohexanone. Also, since benzene is a non-polar solvent, strong mineral acids (like H2SO4) cannot be used as it will not dissolve in benzene. Hence TsOH is chosen.

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Gaer Strom  Follow
It is worth noting that benzene forms an azeotrope with water so the water produced by the reaction can be removed e.g. by Dean-Stark reflux to drive the reaction to completion. Benzene however, is not used these days because of its high carcinogenicity, toluene is the safer choice.More
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Helen Abela  Follow
My experience with this reaction is that a catalyst is not mandatory. While the Org. Syn. prep. (More
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Francesco Davini  Follow
prepchem.com/cyclohexanone-morpholine-enamine-ii/.More
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Gary Smith  Follow
) employs p-TsOH, this one doesn’t ( More
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Héctor López  Follow
orgsyn.org/demo.aspx?prep=CV5P0808More
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