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- How do you assign R or S to a molecule when the lowest-priority group is not oriented toward the back, on a dashed wedge?Please help answer the following question...thank you! Given the three potential constitutional isomers that you answered for problem 4, please examine the following 1H-NMR data, including integration and resonance assignments, and decide which of the molecules matches most closely with the spectral data. **I have attached the answer from problem 4 as well.why is this S not R(I means the one that I circle in red color) 123 or 134???if go 123 it would be R,if it goes 134,it would be s?so confusing?Can anyone make it clear?Please help and explain in details
- Assign the stereochemical configuration (R or S) for each molecule. Show your work, indicating clearly which groups are assigned which priorities (#1 through #4) (e.g. by including the priority # directly adjacent to one of the atoms in that group).10) The following spectra correspond to xylenes (dimethylbenzenes) ortho, meta and para. Which corresponds to which?Draw the structure of a meso form of 1,3-dichlorocyclopentane. Take particular care to indicate three-dimensional stereochemistry detail properly.
- Which of the following substituents is a meta detector? -CN -Cl -CH2CH3 -OHDesignate homotopic, enantiotopic, or diastereotopic for the hydrogens present in the molecules belowThe NMR spectrum of bromocyclohexane indicates a low field signal (1H) at δ 4.16. To room temperature, this signal is a singlet, but at -75 ° C it separates into two peaks of unequal area (but totaling one proton): δ 3.97 and δ 4.64, in ratio 4.6: 1.0. How do you explain the doubling in two peaks? According to the generalization of the previous problem, what conformation of the molecule predominates (at -75 ° C)? What percentage of the molecules does it correspond to? Solve all parts otherwise down vote and hand written solution
- Long-range coupling between protons more than two carbon atoms apart is sometimes observed when bonds intervene. An example is found in 1-methoxy-l-buten-3-yne. Not only does the acetylenic proton, Ηa, couple with the vinylic proton Hb, it also couples with the vinylic proton Hc, four carbon atoms away. The data are: Construct tree diagrams that account for the observed splitting patterns of Ηa, Hb, and Hc.Please help! Part 3B Set 1. Can IR spectroscopy be used to differentiate between the two compounds? Briefly explain why or why not. What significant absorptions would be observed in the IR spectrum?If the imaginary replacement of either of two protons forms enantiomers, then those protons are said to be enantiotopic. The NMR is not a chiral probe, and it cannot distinguish between enantiotopic protons. They are seen to be “equivalent by NMR.” What other protons in cyclobutanol are enantiotopic?