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Results: i. Moles of benzaldehyde= 0.424g/106.12 g/mol= 0.0040 moles/2 moles= 0.0019977 moles ii. Moles of acetone= 0.116g/58.08 g/mol= 0.0019972 moles iii. Moles of sodium hydroxide= 3M x 0.004L= 0.012 moles iv. Moles of ethanol= 3mL x 0.789g/mL= 2.367g/46.07 g/mol= 0.0514 moles v. Moles of water= 9g/18g/mol= 0.5 moles vi. Limiting reagent= acetone vii. Theoretical moles of dibenzalacetone= 0.0019972 moles viii. Actual moles of dibenzalacetone= 0.095g/234.29 g/mol= 0.000405 moles ix. Percentage yield= 0.000405/0.0019972 x 100= 20.3% a. Melting point of dibenzalacetone= 105-110◦C
Discussion:
In comparison to the literature value of the melting point, 110.5-112C, the experimental value was slightly lower. This could have been a result of ethanol still in the product or water still present. The percentage yield, however, was not very good; however, judging by the melting point of the product, these results it can be deduced that the desired product was …show more content…
There are peaks at 1490 and 1590 which indicate that there are benzene rings in the final product. However the band positions of carbonyl compounds 1670-1780 could not be observed other than one peak at 1670 which is close to the band position of carbonyl compounds. There was a peak observed at 3050 which matches the bands of alkanes.
NMR:
The peaks just above 7.0 correspond to the protons on the attached to the carbon at the b position, attached both to the double bond and the benzene. This proton is in a trans position due to the double bond, yet it is more shielded than the proton adjacent to it, the one attached to the carbonyl group. It is also a doublet because there is only 1 proton adjacent to it. The next peaks at just under 7.5 correspond to the protons that are on the c position in the benzene ring. It is a triplet because they are only next to 2 other protons and they are more shielded than the other protons on the benzene ring. The next peaks, at about 7.7, correspond to the other protons located on the benzene ring. There are multiple peaks due to the various protons adjacent to them. They are more deshielded because they are in the beta position to the other protons on the ring. The final set of peaks, at 7.8, corresponds to the proton
Discussion:
In comparison to the literature value of the melting point, 110.5-112C, the experimental value was slightly lower. This could have been a result of ethanol still in the product or water still present. The percentage yield, however, was not very good; however, judging by the melting point of the product, these results it can be deduced that the desired product was …show more content…
There are peaks at 1490 and 1590 which indicate that there are benzene rings in the final product. However the band positions of carbonyl compounds 1670-1780 could not be observed other than one peak at 1670 which is close to the band position of carbonyl compounds. There was a peak observed at 3050 which matches the bands of alkanes.
NMR:
The peaks just above 7.0 correspond to the protons on the attached to the carbon at the b position, attached both to the double bond and the benzene. This proton is in a trans position due to the double bond, yet it is more shielded than the proton adjacent to it, the one attached to the carbonyl group. It is also a doublet because there is only 1 proton adjacent to it. The next peaks at just under 7.5 correspond to the protons that are on the c position in the benzene ring. It is a triplet because they are only next to 2 other protons and they are more shielded than the other protons on the benzene ring. The next peaks, at about 7.7, correspond to the other protons located on the benzene ring. There are multiple peaks due to the various protons adjacent to them. They are more deshielded because they are in the beta position to the other protons on the ring. The final set of peaks, at 7.8, corresponds to the proton