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Chapter 12: 35a E (page 385)

Question: At what approximate positions might the following compounds show

IR absorptions?

(a)

Short Answer

Expert verified

(a) It shows a distinguished absorption due to ketone at 1735cm-1.

Step by step solution

01

Step-by-step SolutionStep 1:IR absorption

In general, IR absorption is 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 the functional group are bound by covalent bonds with one another and with rest of the molecule.

The functional group in compound (a) is ketone (C=O) only.

03

Position at which compound show IR absorptions

(a)

It shows a distinguished absorption due to ketone at 1735cm-1. The functional group in thus compound is only ketone group.

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Most popular questions from this chapter

Question: Grignard reagents undergo a general and very useful reaction with

ketones. Methylmagnesium bromide, for example, reacts with cyclohexanoneto yield a product with the formulaC7H14O . What is the structure of this product if it has an IR absorption at 3400cm-1?

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.

The infrared spectrum of the compound with the mass spectrum shown below has strong absorbances at 1584, 1478, and 1446 cm-1 . Propose a

structure consistent with the data.

How would you prepare the following substances, starting from any

compounds having four carbons or fewer?

Which of the following bases could be used to deprotonate 1-butyne?

(a) KOH
See all solutions

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