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Chapter 12: Q35d E (page 385)

At what approximate positions might the following compounds show

IR absorptions?

Short Answer

Expert verified

(d) It shows one distinguishing absorption due to ester at 1735cm-1

Step by step solution

01

Step 1:IR absorption

In general, IR absorption are caused by the interaction between the IR electric field vector and molecular dipole transition related to the molecular vibrations. Absorption is at maximum when the electric field vector and dipole transition moment are parallel to each other.

02

Identify the functional group

Functional groups are groups of one or more atoms with distinctive chemical properties regardless of what is attached to them.

The atoms of functional group are bound by covalent bonds with one another and with rest of the molecule.

The functional group in compound (d) is ester only.

03

Position at which compound show IR absorptions

(c)

(d) Absorption of ester at 1735 cm-1

It shows one distinguishing absorption due to ester at 1735cm-1

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Most popular questions from this chapter

Question: The infrared spectrum of the compound with the mass spectrum shown below has strong absorbances at 1584, 1478, and . Propose a

structure consistent with the data.

Question: What functional groups might the following molecules contain?

(a) A compound with a strong absorption at 1710cm-1

(b) A compound with a strong absorption at 1540cm-1

(c) A compound with strong absorptions at 1720cm-1 and 2500 to 3100 cm-1

Predict the product(s) and provide the mechanism for each reaction below. What does each mechanism have in common?

Where might the following compound have IR absorptions?

Aprobarbital, a barbiturate once used in treating insomnia, is synthesized in three steps from diethyl malonate. Show how you would synthesize the necessary dialkylated intermediate, and then propose a mechanism for the reaction of this intermediate with urea to give aprobarbital.
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