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Question
Chemistry
Posted 6 months ago
assign the 13C spectrum.AND PROPOSE STRUCTURE FOR 4-Ethoxy Benzaldehyde.
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Answer from Sia
Posted 6 months ago
Solution
1
Assign the \(^{13}C\) NMR spectrum: To assign the 13C^{13}C NMR spectrum for 4-Ethoxybenzaldehyde, we need to consider the different types of carbon environments in the molecule
2
Identify carbon environments: In 4-Ethoxybenzaldehyde, there are several distinct carbon environments: the carbonyl carbon (C=O), the aromatic carbons, the carbon in the ethoxy group attached to the aromatic ring, and the methyl carbons in the ethoxy group
3
Predict chemical shifts: The carbonyl carbon will have the lowest field (highest ppm) chemical shift due to its high electronegativity. Aromatic carbons will have chemical shifts in the region typical for aromatic rings. The carbon in the ethoxy group attached to the ring will be deshielded due to the oxygen, and the methyl carbons will have the highest field (lowest ppm) chemical shift
4
Propose structure: The structure of 4-Ethoxybenzaldehyde can be deduced from the name. It has an ethoxy group (-OCH2CH3) attached to the fourth carbon of a benzaldehyde (benzene ring with an aldehyde group)
1 Answer
The 13C^{13}C NMR spectrum of 4-Ethoxybenzaldehyde will show distinct signals for the carbonyl carbon, the aromatic carbons, the ethoxy carbon attached to the ring, and the methyl carbons of the ethoxy group.
Key Concept
Assigning 13C^{13}C NMR spectra involves identifying distinct carbon environments and predicting their chemical shifts.
Explanation
The 13C^{13}C NMR spectrum is determined by the electronic environment of each carbon, which affects its chemical shift. The structure of 4-Ethoxybenzaldehyde provides a basis for predicting the number and type of signals expected.

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