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Chapter 21: 30P (page 817)

Label each compound as an acetal, a hemiacetal, or an ether.

a.

b.

c.

d.

Short Answer

Expert verified

a. Ether

b. Open acetal

c. Cyclic acetal

d. Hemiacetal

Step by step solution

01

Acetal, hemiacetal, and ether

In acetal, two -OR groups are attached to the carbon atom, while in a hemiacetal, one of the -OR groups is replaced by an -OH group.An ether contains a C-O-R bond.

02

Classfication of compounds

The compounds are classified into acetals, hemiacetals, and ethers as follows:

a. This is an ether where there is R-O-R bond such that R is an alkyl group.


Ether

b. This is an open acetal that has two -OR groups attached to the carbon atom.


Open acetal

c. This is an closed acetal that has two -OR groups attached to the carbon atom in a cyclic ring.

Cyclic acetal

d. This is a hemiacetal where one -OR group is replaced by an -OH group attached to the carbon atom.

Hemiacetal

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Most popular questions from this chapter

Hydroxy aldehydes A and B readily cyclize to form hemiacetals. Draw the stereoisomersformed in this reaction from both A and B. Explain why this process gives an opticallyinactive product mixture from A, and an optically active product mixture from B.

Draw the products of the following Wittig reactions

a.

b.

Identify the acetal in oleandrin, and draw the products formed by acid-catalysed hydrolysis of the acetal.

Give the IUPAC name for each compound.

a.

b.

c.

d.

e.

f.

What cyanohydrin and carbonyl compound are formed when amygdalin is metabolized in a similar manner to linamarin?
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