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QUESTION

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

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

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

"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, "R" = "C"_6"H"_5, "R'" = "CH"_3, and "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