Determining product purity

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PatchworkTeapot
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In our lab, we used nonanoyl chloride and cholesterol in a reaction with the predicted product cholesteryl nonanoate. This product is known to have liquid crystal properties, which we observed by preparing a liquid crystal display. However, the melting point/mesophase range theoretical values were significantly lower than the experimental values determined. This suggests that there may have been some cholesterol still present in the product.

What other tests could we use to determine purity or find more conclusive evidence of what the product actually is?
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charco
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(Original post by PatchworkTeapot)
In our lab, we used nonanoyl chloride and cholesterol in a reaction with the predicted product cholesteryl nonanoate. This product is known to have liquid crystal properties, which we observed by preparing a liquid crystal display. However, the melting point/mesophase range theoretical values were significantly lower than the experimental values determined. This suggests that there may have been some cholesterol still present in the product.

What other tests could we use to determine purity or find more conclusive evidence of what the product actually is?
Just my rambling thoughts ...

If you compare the IR for both pure and sample you may find that the fingerprint region has differences, as your one has an ester grouping and the reactant only an OH.

You could attempt to separate the product mixture using TLC to see if you get two spots (run it against cholesterol and some pure product)
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