Two IR spectrums are to be matched with two compounds cyclohepta-1, 3-diene and 3-methylcyclohexa-1, 4-diene where one IR spectrum has an absorption band at 1648 cm − 1 and the other at 1618 cm − 1 . Concept introduction: IR spectroscopy enables us to identify different functional groups in the molecule. One of the greatest advantages of IR spectroscopy is that the frequency of a particular type of vibration is typically found within a characteristic range of frequencies, regardless of the functional group with which the vibration is associated. The fact that absorptions by certain vibrations appear with characteristic frequency ranges enables us to use IR spectroscopy to obtain structural information about a molecule. The C=C absorptions for alkene appears at ~1620 − 1680 cm − 1 . The absorption frequency of the conjugated C=C or C ≡ C bonds lowers by 20 − 40 cm − 1 .

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Chapter 15, Problem 15.47P

Interpretation Introduction

Interpretation:

Two IR spectrums are to be matched with two compounds cyclohepta-1, 3-diene and 3-methylcyclohexa-1, 4-diene where one IR spectrum has an absorption band at 1648 cm−1 and the other at 1618 cm−1.

Concept introduction:

IR spectroscopy enables us to identify different functional groups in the molecule.

One of the greatest advantages of IR spectroscopy is that the frequency of a particular type of vibration is typically found within a characteristic range of frequencies, regardless of the functional group with which the vibration is associated. The fact that absorptions by certain vibrations appear with characteristic frequency ranges enables us to use IR spectroscopy to obtain structural information about a molecule. The C=C absorptions for alkene appears at ~1620−1680 cm−1. The absorption frequency of the conjugated C=C or C≡C bonds lowers by 20−40 cm−1.

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I have a question about this problem involving mechanisms and drawing curved arrows for acids and bases. I know we need to identify the nucleophile and electrophile, but are there different types of reactions? For instance, what about Grignard reagents and other types that I might not be familiar with? Can you help me with this? I want to identify the names of the mechanisms for problems 1-14, such as Gilman reagents and others. Are they all the same? Also, could you rewrite it so I can better understand? The handwriting is pretty cluttered. Additionally, I need to label the nucleophile and electrophile, but my main concern is whether those reactions differ, like the "Brønsted-Lowry acid-base mechanism, Lewis acid-base mechanism, acid-catalyzed mechanisms, acid-catalyzed reactions, base-catalyzed reactions, nucleophilic substitution mechanisms (SN1 and SN2), elimination reactions (E1 and E2), organometallic mechanisms, and so forth."