Experiment 8 discussion

Experiment 8 discussion - E xperiment 8 Discussion On plate...

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Experiment 8 Discussion On plate # 4 compound numbers 521, 522, 523 and the unknown 524 were spotted. The results of our compounds were caraway (521), cloves (522), and coriander and (523). These were identified through smell, UV, Iodine, DNPH, and R f value. A helpful early sign was that all the unknown compounds were DNPH negative. This meant there were no aldehyde or ketone functional groups. This ruled out 3-phenylpropenal and 4-(1- methylethyl)benzaldehyde. For caraway, we identified it through its active known compound, 2- methyl-5(1-methylethyl)-2-cyclohexene-1-one. It exhibited a similar R f value in 90:10 hexane: ethyl acetate as caraway. Both were also UV and I 2 active and DNPH negative. Cloves was identified in a similar fashion. It was compared with its active ingredient, 2-methoxy-4-(2-propenyl)phenol. When the thin layer chromatography plates 2 and 3 were compared, the compound and the active ingredient had similar R f value. Both were iodine and UV active, and both were DNPH negative.
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On plate 4 we were looking for similarities between the unknown compound (524) and a previously identified compound. The unknown exhibited 5 spots: three iodine spots with the highest R
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This note was uploaded on 02/21/2011 for the course CHEM 3A taught by Professor Fretchet during the Spring '08 term at Berkeley.

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Experiment 8 discussion - E xperiment 8 Discussion On plate...

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