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Alkyl Bromide And Ketone Lab Report

843 Words4 Pages

The purpose of this experiment was to identify the unknown alkyl bromide and ketone using a Grignard reaction and IR spectrum. Also, retrosynthesis analysis was used to determine the success of identifying starting material. The organometallic compounds have a carbon-metal bond that is used to create alcohol and to expand chains of carbons. Grignard reagents, a part of organometallic ionic compounds, are widely used in organic synthesis because they are considered strong base, strong base carbon nucleophile, and soluble in many organic solvents. Results: Alkyl bromide #24 and alkyl ketone #24 was assigned. During the first week of the experiment, the Grignard reagent was prepared from an alkyl bromide and magnesium. During the hydrolysis, …show more content…

At 3411 cm-1, it had a broad peak which means that it contained the alcohol, -OH. Carbonyl group was reduced to an alcohol. There was also C-H stretch at 2958.29 cm-1 and 2873.29 cm-1. There was a peak at 1716.94 cm-1 which means that C=O ketone bond exists in the final product. A C=O ketone bond is found in the 2-butanone, the starting ketone sample in this experiment. The presence of that peak indicates that some ketones were carried with the …show more content…

The presence of ketone in IR shows that all of the ketones did not react to form the Grignard reagent because the magnesium oxidized or there was still water remains in the funeral which makes the Grignard reagent to react with water instead. Once the magnesium is oxidized, it would not react again. Therefore, it is necessary to make sure the apparatus dry enough before the experiment. When thermocouple was placed into the glassware, the measuring tip was not in the neck of the distillation head and far away from the insulated. As a result, the resultant boiling point of alcohol would be lower than the actual boiling point. In the future experiment, making sure the thermocouple is in the right position is important to obtain an actual boiling point of its compound. Also, when reaction flask was placed in the ice bath, the solution was left in the cool longer than supposed to be. The rate of the reaction increases with the temperature, so cooling the reaction too much will stop the reaction. The Grignard reagent could not form if the reaction stops. It is important to cool the reaction moderately and stop when the vapors do not come out of the

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