Question

Give a detailed mechanism for this reaction and give a separation scheme

NUCLEOPHILIC ACYL SUBSTITUTION: Synthesis of an Ester Isoamyl acetate (Banana Oil) Purpose This experiment demonstrat and alcohol. The technique of refluxing the reaction mixture is introduced. es the procedure for the synthesis of an ester from a carboxylic acid Esters are an important functional group in organic chemistry, and esters are found widely distributed in nature. Many lower molecular weight esters are associated with natural fuit flavors and fragrances. A fruit may contain several esters and other compounds in combination, which accounts for the unique fruit flavor. However, sometimes one ester's odor is reminiscent of just one fruit. For example, isoamyl acetate smells very much like bananas and is often referred to as "banana oil". See the table at the end of this experiment. Esters can be synthesized by a variety of methods. One of the simplest is the direct reaction between a carboxylic acid and an alcohol in the presence of a strong acid catalyst. This method is known as a "Fischer Esterification". The by-product of the reaction is water. Reactions that produce water are often called "condensation" reactions An esterification reaction equation is shown below. The reaction is reversible, with an equilibrium constant (depending on R and R) that results in a roughly 1:1 mixture of the reactants and products when the reactants are mixed in equimolar amounts. In order to shift the equilibrium to favor the ester product, an excess of one of the reactants may be used (Le Chátelier's Principle). The less expensive and more readily available reactant is normally used in excess. A strong acid catalyst, such as sulfuric acid, is used to bring the system to equilibrium within a few hours Consult your lecture textbook for the multi-step mechanism for this reaction, which is nucleophilic acyl substitution. Notice that the reverse reaction, also a nucleophilic acyl substitution, is the hydrolysis of an ester to produce an alcohol and carboxylic acid. If this were the desired reaction, water would be used in excess. In the experiment today, you will synthesize banana oil (isoamyl acetate) from acetic acid and isopentyl alcohol. (Another common name for "isopentyl" is "isoamyl". Notice that the ester name is a combination of the alcohol and carboxylic acid constituents' names.) Acetic acid is the -127

Answer 1

DATE eperah me Some cmount xtur mou remain unreackal Ho, Exrachon (Spr Ester, auhca + alcohd Cunrcackd) ag, Soluhon en Ester+ H unrcack niclaie olid dishilahn Retiever alchst-