# What is the structure of the acetal formed by reaction of ethanol with acetophenone?

Nov 17, 2015

The structure of the acetal is "C"_6"H"_5"C"("CH"_3)("OCH"_2"CH"_3)_2.

#### Explanation:

The structure of the acetal is "C"_6"H"_5"C"("CH"_3)("OCH"_2"CH"_3)_2.

Ketones react in the presence of acids to form hemiacetals, and the hemiacetals can react further to form acetals.

The general equation is

$\text{RCOR' + 2R''OH" stackrel("HCl")(→) "RR'C"("OR''")_2 + "H"_2"O}$

The mechanism is

(from en.wikipedia.org)

In the addition of ethanol to acetophenone, ${\text{R" = "C"_6"H}}_{5}$, ${\text{R'" = "CH}}_{3}$, and ${\text{R''" = "CH"_2"CH}}_{3}$.

So the structure of the acetal is given by the equation

"C"_6"H"_5"COCH"_3 + "2CH"_3"CH"_2"OH" stackrel("HCl")(→) "C"_6"H"_5"C"("CH"_3)("OCH"_2"CH"_3)_2