Dialog using english to show cause and effect
Eka : Hallo Fauzan
Fauzan : Hi Eka
Eka : Fauzan, I want to ask you, what is
ester?
Fauzan : Ester is a compound with a functional group -
COO - in the middle of alkyl, R 'and R'' represents a carbon chain.
Eka : What happens if I react acetic acid
with ethanol in an acid catalyst?
Fauzan : It will produce ethyl acetate (ester) and
also water. Ethyl acetate is an example of an ester.
Eka : Try to explain the ester's reaction?
Fauzan : The reaction of an alcohol with a carboxylic
acid with an acid catalyst is a Fischer method. The esterification reaction involves
very slow reversible reactions, but when using mineral acid catalysts such as sulfuric
acid (H2SO4) and hydrochloric acid (HCl) equilibrium will be achieved in a short
period of time. In the esterification reaction the H⁺
dai H2SO4 ion plays a role in the preparation of the
ester and also plays a role in the reverse reaction of the ester hydrolysis. In
accordance with the law of mass action, in order to obtain high ester yields the
equilibrium should shift towards ester formation. Is it possible that
ester manufacture can happen other than what I mentioned?
Eka : Other than what you mentioned I have studied the preparation of the ester by reacting an acid chloride or an anhydrous acid with alcohol or phenol.
Fauzan : Thank you for your knowledge
Eka : Equally
Why esters can produce the smell of fruits?
BalasHapusWhich makes each ester has a different aroma Influenced molecular structure of alcohol, process temperature and the concentration of catalyst and reaktan.oleh therefore of course if there is a change of structure of the derived chain will make a change of aroma.
HapusBased on the type of acid and its constituent alcohols, the esters are commonly grouped into three classes, ie fruit esters, waxes and fats.
Ester compounds with short chains (esters
Derived from low-tension carboxylic acids with low-alcohol alcohols) are present in many fruits
Which gives rise to the aroma of the fruit, so called the fruit ester.
Can you mention other examples of ester other than those in the conversation above?
BalasHapusEsters having 10 carbon atoms or less (ie ester of low-tension carboxylic acid with low-alcohol alcohols) at room temperature are volatile liquid and have a delicious aroma. Many of them are in fruit or fruit, so it is called fruit ester. This tasty oster, both natural and synthetic, is used as a flavoring or essen.
HapusExample
Ester Aroma
A. Ethyl format Rum
B. Propyl acetate Pears
C. Isopropyl Acetate Banana
D. N - Octil Acetate Sweet orange
E. Methyl Butirat Apel
F. Ethyl Butirate Pineapple
G. Metil Salisilat Sarsaparila
How ester made? please explain more
BalasHapusThe ester will be formed by the reaction between the alcohol and the carboxylic acid in the acidic atmosphere. The reaction of the carboxylic acid introduction is also the reaction of the ester manufacture. The reaction of an alcohol with a carboxylic acid with an acid catalyst is a Fischer method. This reaction is easy to practice, although the presence of strong acids makes this reaction slow. However, the reaction will be faster if reflux is done. An example of a simple esterification reaction is the reaction of ethyl acetate manufacture.
Hapus