Concept explainers
Interpretation:
To identify the pairs of coupled protons in the compound from the given COSY spectrum.
Concept introduction:
A two-dimensional spectrum is used to analyse the complex structures such as proteins and carbohydrates instead of the simple one-dimensional spectrum. The most common two-dimensional spectrum used is COSY.
COSY stands for homonuclear
To analyse a COSY spectrum first a diagonal line is drawn passing through the dots such that it bisects the spectrum. Each dot represents a separate signal. The dots that do not lie on the diagonal line are called the cross peak. Cross-peak shows the pair of the coupled proton.
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Chapter 14 Solutions
Organic Chemistry - MasteringChemistry
- Select the compound from each group that matches the HNMR spectrum shown below.arrow_forwardHow many peaks can you identify from the NMR spectrum? To which does each chemical shift peak corresponds?arrow_forwardFor the structure shown, identify in a drawing the groups of homotopic protons and from these, the group with the lowest and the group with the highest shift values. Give an estimate for these shift values.arrow_forward
- Match each of the following compounds to one of the HNMR spectra shown below.arrow_forwardIn the HNMR spectrum shown below: A. Signals “a” and “b” appear at different chemical shifts. Why is this so? B. Which proton, 1 or 2, matches signal “a”? C. Why do both signals have the same intensities?arrow_forwardWhat splitting pattern is observed for each proton in the following compounds?arrow_forward
- Rank the indicated protons in order of increasing 1H NMR chemical shift.arrow_forwardHow many 1 H NMR signals (not peaks) would you predict for each of the following compounds? (Consider all protons that would be chemical shift non-equivalent)arrow_forwardRank each group of protons in order of increasing chemical shift.arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning