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Methyl Acetate Lab Report

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Throughout the experiment, many decisions had to be made. One of the major decisions being to choose the right solvent to perform recrystallization in. It was decided, between the choice of ethanol and ethyl acetate, that ethanol was to be used for recrystallization. This was decided by testing the solubility of the product in both solutions. In ethyl acetate, the product readily dissolved, while in ethanol it needed heat to dissolve. The Aldol condensation reaction consisted of mixing two unknowns, A345 (a liquid) and a B192 (a solid). Through a series of chemical tests, A192 is concluded to be a methyl ketone and B192 is an aldehyde. According to the Tollens Test, which tests for aldehydes, B192 turned gray while the liquid did not. In the Chromic acid test, which also tests for aldehydes, B192 turned into a green liquid while A345 had no reaction. …show more content…
According to the Iodoform test which tests for methyl ketones, A345 turned cloudy in the test tube while the B192 did not have any color change, and A345 is concluded to be the ketone. The chemical formula of A345 is C10H9O. In the A345 HNMR, there are 2 methyl groups present, indicated by the two singlets with an integration of about 3 at around 2.42 ppm and 2.58 ppm. The compound is UV active, and because the degrees of unsaturation is 5, there is a benzene ring. The chemical formula indicates that there is a total of 10 hydrogens, and there are two doublet signals on the HNMR that indicate that there is an integration 2 at 7.86 ppm and 7.26 ppm (the singlet signal at 7.26 ppm is chloroform), which means that the methyl group splits the benzene in half due to its splitting and integration. So the inferred structure of the liquid starting material A345 is a 4-methylacetophenone. The B192 chemical formula is C7H5ClO. In the B192 HNMR, there is a singlet with an integration of 1 at 9.99 ppm that correlates to the aldehyde

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