1).In the resolution of racemic 1-phenylthylamine that you carried out, where is
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Question
1).In the resolution of racemic 1-phenylthylamine that you carried out, where is the (R)-(+)-1-phenylethylamine? How would you isolate it (recover the pure oil)?
2. If the ml of racemic 1-phenylethylamine is resolved with (R).(R)-(+)-tartaric acis, what is the maximum amount (in grams) of (S)-(-)-1-phenylethylamine that can be recovered?
Questions i. In the resolution of racemic 1-phenylethylamine that you carried out, where is the (R)- (+)-1-phenylethylamine? How would you isolate it (recover the pure oil)? 2. If 1 ml of racemic 1-phenylethylamine is resolved with (R),0R)-(+0-tartaric acid, what is the maximum amount (in grams) of (S)-(-0-1-phenylethylamine that can be recovered? 3. If a TA makes up two different solutions of (S)-(-)-1-phenylethylamine, using the same source of the amine but of different concentrations, will the observed rotation of the two samples be different? Will the specific rotation of the two samples be different?Explanation / Answer
1).In the resolution of racemic 1-phenylthylamine that you carried out, where is the (R)-(+)-1-phenylethylamine? How would you isolate it (recover the pure(S)-(-)-1-phenylethylamine oil)?
(S)-(-)-1-phenylethylamine and R).(R)-(+)-tartaric acid will become salt that you will fliter it. In the filterate (R)-(+)-1-phenylethylamine will be present. If we need it we can recover by workuping with organic solvent.
2. If the ml of racemic 1-phenylethylamine is resolved with (R).(R)-(+)-tartaric acis, what is the maximum amount (in grams) of (S)-(-)-1-phenylethylamine that can be recovered?
1-phenylthylamine Density: 940 kg/m³
1 ml 1-phenylthylamine = 0.94 gm
Maximum yield = 50%
Yield in grams = 0.47 gm
3. If a TA makes up two different solutions of (S)-(-)-1-phenylethlamine, using the same source of the amine but of different concentrations, will the observed rotation of the two samples be different? Will the specific rotation of the two samples be different?
[]lT = /lc
The above formula is used for calculating specific rotations where c is Concentration , Hence if concentration differs then specific rotation also will be different.
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