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Isomers Lab Report Essay

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In this experiment, different properties of stereoisomers, specifically enantiomers and diastereomers, were analyzed. R-Carvone and S-Carvone, which are enantiomers, were analyzed for opposite plane polarization and different odor. An isomerization was performed on dimethyl maleate to convert it into dimethyl fumarate, a diastereomer.
Isomers are compounds with the same empirical formula, but with different arrangements of the elements. Enantiomers, a type of isomer, are two compounds that are chemically similar, but are arranged as non-superimposable mirror images of each other. Enantiomers tend to have many similar chemical properties, such as melting point and solubility. In this experiment a pair of enantiomers, S-Carvone and R-Carvone …show more content…

This melting point data confirms that isomerization occurred, since the melting point of dimethyl maleate is only -17℃, while the melting point of dimethyl fumarate is 102-105℃. This also highlights the fact that diastereomers have different chemical properties, such as melting point. Since the experimental melting point range almost overlaps with the expected range, there is little error in this measurement. The small amount of error could have occurred from the MelTemp temperature rising too quickly, leading to errors when reading the …show more content…

The results were expected, since a difference in the odors of the enantiomers was detected, and the polarimeter showed that the two enantiomers rotated light to about the same degree in opposite directions. In the polarimetry experiment, the two absolute values of degrees of rotation were not exactly identical due to small errors caused by dust or other impurities in the sample. In the oil wafting experiment, some may not have been able to differentiate between the two enantiomers if their noses lacked the chiral receptors required to recognize this

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Chem 51LB Report Ngoc Tran - Student ID # 72048507 The purpose of this lab is to examine the composition of three components of gas products of elimination reaction under acidic condition by conducting the dehydration of primary and secondary alcohol, and under basic condition by conducting the base-induced dehydrobromination of 1-bromobutane and 2-bromobutane. Then gas chromatography is used to analyze the composition of the product mixtures. Gas chromatography (mobile phase) is used to analyze the composition of three components of the gas products. A syringe needle with gas product is injected into the machine, and the component is eluted and the composition is related to the column or the peaks.

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Nevertheless, the latter is not used in this experiment since it is very reactive and extremely flammable. On the contrary, NaBH4 is relatively mild and it can be used with protic solvents. In this manner, 1.507 grs of the ketone 9-fluorenone were mixed with 30.0 ml of 95% ethanol in a 125 ml Erlenmeyer flask. The bright yellow mixture was stirred during 7 minutes until all the components were dissolved.

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Introduction: Isopods are crustacean, which is split into smaller groups, called order. Scientifically Isopoda order is called isopods, which include pill bugs and sow bugs (Crustacean class). Most of the time isopods are mistaken for “bugs” since they look like insects.

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In the first part of the experiment, Part A, the standard solutions were prepared. As a whole, the experiment was conducted by four people, however, for Part A, the group was split in two to prepare the two different solutions. Calibrations curves were created for the standard solutions of both Red 40 and Blue 1. Each solution was treated with a serial 2-fold dilution to gain different concentrations of each solution.

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The product obtained was (2S, 3R)-2, 3-dibromo-3-phenylpropanoic acid and (2R, 3S)-2, 3-dibromo-3-phenylpropanoic acid, which are enantiomers. This was determined through melting point analysis. The melting point range for the product was 198 to 202 degrees Celsius, which is a lot close to the given melting point of the anti-addition product, 202-204 degrees Celsius. The given melting point range was 93.5-95 degrees Celsius. Furthermore, the syn-addition product is unlikely and difficult to produce due to stereochemistry selectivity.

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The possible explanations and changes to make are similar to the previous questions. Conclusion and Future Experiment 18. The identity of the product and unknown were 4-tert-butylbenzyl phenol ether and tert-butyl phenol respectively. The key to making this discovery was the melting point and TLC results!

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Abstract – Methyl trans-cinnamate is an ester that contributes to the aroma of strawberry. It can be synthesized by an acid-catalyzed Fischer esterification of a methanol and trans-cinnamic acid under reflux. The solution was extracted to obtain the organic product, and evaporated residual solvent The yield was 68%, but there is some conflicting data regarding the purity. The melting point, IR, GC-MS indicate a highly pure desired product whereas 1H NMR shows there are unreacted reagents still present.

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