How many signals are produced by each of the following compounds in its
b. ¹³C NMR spectrum?
4.

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Step 1: Analyze the structure of the compound provided. The compound is an ether with a cyclic structure and an alkyl chain attached. Identify all unique carbon environments in the molecule.

Step 2: Recall that in 13C NMR spectroscopy, each unique carbon environment produces a distinct signal. Carbons in identical environments (symmetry) will produce the same signal.

Step 3: Examine the cyclic portion of the molecule. The ring contains carbons that are not equivalent due to the presence of the oxygen atom and the alkyl substituent. Count the unique carbon environments in the ring.

Step 4: Examine the alkyl chain attached to the ring. The chain contains carbons that are in different environments due to their positions relative to the ring and the oxygen atom. Count the unique carbon environments in the chain.

Step 5: Sum the number of unique carbon environments identified in the ring and the alkyl chain. This total represents the number of signals that will be observed in the 13C NMR spectrum for this compound.

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Carbon Environment

In 13C NMR spectroscopy, each unique carbon environment in a molecule produces a distinct signal. This means that carbons in different chemical environments, such as those bonded to different functional groups or in different hybridization states, will resonate at different frequencies, leading to separate peaks in the spectrum.

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Carbonation of Grignard Reagents

Symmetry and Equivalent Carbons

Molecules with symmetrical structures can have equivalent carbons that do not produce separate signals in the NMR spectrum. Identifying symmetry in a compound helps in determining how many unique signals will appear, as equivalent carbons contribute to a single peak rather than multiple peaks.

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Determining Chirality with Plane of Symmetry

Integration and Peak Area

In 13C NMR, the area under each peak corresponds to the number of carbons contributing to that signal. While integration is more commonly discussed in 1H NMR, understanding that the intensity of a signal can indicate the number of equivalent carbons is crucial for interpreting the spectrum and confirming the number of signals.

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