For the following reaction, what significant changes would be expected by IR absorptions, (ignoring C-H absorption): * a. NaNH2 b. CH;CH,I a peak around1710/cm would appear a peak around 2150/cm would disappear a peak around 1710/cm would disappear No change observed.

For the following reaction, what significant changes would be expected by IR absorptions, (ignoring C-H absorption): * a. NaNH2 b. CH;CH,I a peak around1710/cm would appear a peak around 2150/cm would disappear a peak around 1710/cm would disappear No change observed.

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter20: Dienes, Conjugated Systems, And Pericyclic Reactions

Section: Chapter Questions

Problem 20.24P: Pyridine exhibits a UV transition of the type n at 270 nm. In this transition, one of the unshared...

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Concept explainers

Reactions of Ethers

Ethers (R-O-R’) are compounds formed by replacing hydrogen atoms of an alcohol (R-OH compound) or a phenol (C6H5OH) by an aryl/ acyl group (functional group after removing single hydrogen from an aromatic ring). In this section, reaction, preparation and behavior of ethers are discussed in the context of organic chemistry.

Epoxides

Epoxides are a special class of cyclic ethers which are an important functional group in organic chemistry and generate reactive centers due to their unusual high reactivity. Due to their high reactivity, epoxides are considered to be toxic and mutagenic.

Williamson Ether Synthesis

An organic reaction in which an organohalide and a deprotonated alcohol forms ether is known as Williamson ether synthesis. Alexander Williamson developed the Williamson ether synthesis in 1850. The formation of ether in this synthesis is an SN2 reaction.

Question

For the following reaction, what significant changes would be expected by IR
absorptions, (ignoring C-H absorption):
a. NANH2
b. CH;CH,I
a peak around 1710/cm would appear
O a peak around 2150/cm would disappear
a peak around 1710/cm would disappear
O No change observed.

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Pyridine exhibits a UV transition of the type n at 270 nm. In this transition, one of the unshared electrons on nitrogen is promoted from a nonbonding MO to a (antibonding) MO. What is the effect on this UV peak if pyridine is protonated?