Preparation of 1 bromobutane and reactivity of

The mechanism is SN2. The overall reaction is:

Preparation of 1 bromobutane and reactivity of

How to Write a Summary of an Article? April 4th, Introduction The overall goal of this experiment is to understand and be familiar of SN1 reactivity. We also learned how to prepare 2-Bromobutane by learning how to distill and extract this product from its organic layer.

Finally, another goal was to specifically understand the relative reactivity of alkyl halides under SN1 conditions by reacting the alkyl halide and silver nitrate in ethanol. Then attach the flask to the apparatus, which is mounted on a Thermowell over a stirrer and a condenser attached to it, along with the thermometer in the flask.

Then the mixture was heated at 90oC then kept at the range of 90oCoC for 30 minutes. When that is completed add 20 mL of water into the flask to perform a simple distillation to collect the distillate in a graduated cylinder, keep doing this until there is no more 2-Bromobutane collected. Use a Pasteur pipette to draw off the organic layer to another container.

Add the potassium carbonate to allow the liquid to dry by swirling it.


Once this is completed the reactivity of alkyl halides under SN1 conditions was tested. Adding two drops of our product and the other different compounds into different test tubes along with 1mL of ethanolic silver nitrate reagent.

We are comparing these by seeing how they react and if there is no reaction after 5 minutes we will place the test tubes in a beaker of water that is heated at a temperature of 70oCoC and observe what happens.

Not Heated 2-Bromomethylpropane After 30 seconds, the mixture was yellow and a precipitate formed instantly. After 5 minutes, the color changed slightly to white and lightly cloudy. Not Heated 2-Iodobutane After 30 seconds, the mixture was yellow and precipitated instantly.

When I was drying the reagent with potassium carbonate, prior to that I had put the other pellets, which were calcium chloride on accident.

Fast registration

This probably affected my percent yield also with the fact that the temperature was not well maintained it kept fluctuating under 90OC. According to the reactivity of alkyl halides, the results of these tables can concluded the theories of the conditions of SN1 reactions.

The first table states that the tertiary carbocation are more stable which allows this reaction to perform faster than second and primary structured carbocations.

Then the second table can concludes that iodine is the best leaving group because it is a much weaker base than the bromide ion and chloride ion causing it to react faster.S N 2 and S N 1 Reactions: Experiments 6 and 7 (Preparation of 1-bromobutane from 1-butanol, 2-chloromethylbutane from 2-methylbutanol) Introduction.

In the name S N 1 or S N 2, the S stands for substitution. One part of the starting molecule is replaced by something else.

Preparation of 1 bromobutane and reactivity of

The experiment was involving second order nucleophilic substituition, S N 1-Bromobutane was prepared from theoretical yield for this experiment is g while the actual yield is g.

The percentage yield is %. the melting point is 95˚C˚C nearly to the boiling point of 1-Bromobutane which is ˚C, so. Pre-lab preparation (1) Write the SN2 reaction of 1-bromobutane with NaI. Illustrate the electron flow with curved arrows. Since this is a one-step reaction, you've just written the mechanism.

course the key to SN1 reactivity is very different. Lucas test for alcohol (ROH) reactivity. 1-Bromobutane is the organobromine compound with the formula CH 3 (CH 2) 3 Br. It is a colorless liquid, although impure samples appear yellowish.

It is insoluble in water, but soluble in organic solvents. It is a primarily used as a source of the butyl group in organic synthesis. It is Molar mass: g·mol−1. The SN2 reaction that converts 1-butanol to 1-bromobutane is a rapid protonation of the alcohol and involves a nucleophile attacking the carbon, which leads to the displacement of the water.

This nucleophile attack is best for primary substrates, which is why it is used by primary alcohols and 1-butanol. Conclusion: Preparation of 1-Bromobutane The purpose of this experiment was to demonstrate the conversion of a primary alcohol, 1-butanol, to a primary bromoalkane, 1-bromobutane, a SN2 reaction.

The conversion of 1-butanol to 1-bromobutane relies on sulfuric acid which plays two important roles.

Preparation of 1-bromobutane | @nazarul