Identify the compound with molecular formula C7H14O that gives the following proton-coupled 13C NMR spectrum: <IMAGE>
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Analyze the molecular formula C7H14O to determine the degree of unsaturation. Use the formula: Degree of Unsaturation = (2C + 2 - H + N - X)/2, where C = number of carbons, H = number of hydrogens, N = number of nitrogens, and X = number of halogens. For C7H14O, calculate the degree of unsaturation to identify the presence of rings or double bonds.
Examine the proton-coupled 13C NMR spectrum. Look for the number of distinct carbon signals, which corresponds to the number of unique carbon environments in the molecule. This will help determine the symmetry and structure of the compound.
Identify the splitting patterns in the proton-coupled 13C NMR spectrum. The splitting of each carbon signal provides information about the number of hydrogens directly attached to that carbon. For example, a triplet indicates two hydrogens attached, a doublet indicates one hydrogen, and a singlet indicates no hydrogens.
Consider the functional group indicated by the molecular formula and the NMR data. The presence of oxygen (O) suggests a functional group such as an alcohol, ether, or carbonyl. Use the chemical shifts in the 13C NMR spectrum to identify the specific functional group (e.g., carbonyl carbons typically appear in the range of 190-220 ppm).
Propose a structure for the compound that matches the molecular formula, degree of unsaturation, and the NMR data. Verify that the structure accounts for all observed signals and splitting patterns in the spectrum, ensuring consistency with the molecular formula C7H14O.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molecular Formula Interpretation
The molecular formula C7H14O indicates a compound containing seven carbon atoms, fourteen hydrogen atoms, and one oxygen atom. Understanding the molecular formula is crucial as it provides insights into the compound's structure, functional groups, and potential isomers. The ratio of hydrogen to carbon suggests that the compound may be an alkane, alkene, or alcohol, influencing its reactivity and properties.
Proton-coupled 13C NMR spectroscopy is a technique used to determine the carbon environment in organic compounds. In this method, the interaction between protons and carbon nuclei provides information about the number of unique carbon environments and their connectivity. Analyzing the spectrum helps identify functional groups and structural features, which are essential for deducing the compound's identity based on its molecular formula.
Isomerism refers to the existence of compounds with the same molecular formula but different structural or spatial arrangements. For C7H14O, various isomers can exist, including alcohols, ethers, and ketones. Recognizing the potential isomers is vital for accurately interpreting NMR data and determining the correct compound, as different isomers can exhibit distinct chemical behaviors and spectral characteristics.