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How do you rationalize the fact that the cyclohexane A value for phenyl (2.8) is bigger than that for isopropyl (2.21)?
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- For the part circled in white, I don't understand when simplifying this why we don't divide the coefficient in front of octane by 2. I thought it would be 1/2 Since we divided the other ones by 2.Thoroughly describe what is meant when a compound is considered aromatic. In your answer, provide examples and be sure to discuss how Huckel's Rule applies, and what it means to be anti-aromatic versus non-aromatic. When providing specific examples to demonstrate the requirements that you list, describe the delocalized pi electrons and sp2 hybridization. Lastly, why is benzene so special compared to alkenes like cyclohexene....both are 6-carbon atom cycles so are they chemically similar or not really similar at all?Write down the Miller index in the grid direction that may be placed on the grid plane (112) among the <110> aromatic groups.
- If you began an experiment with 5.0 mL of cyclopentadiene and 5.16 g of methyl acrylate, and you then isolated 7.2 g of the Diels-Alder adduct, what would the per cent yield be for that experiment? Make sure that you take the “limiting reagent” into consideration in your calculations.If the bromine atom was replaced with a fluorine atom in 2-bromocyclohexanol, would the E-Z notations differ for the resulting molecule?Using the Frost Circle method to outline the molecular orbitals of cyclobutadiene, and identify whether it is aromatic, antiaromatic or non-aromatic. Explain.
- The German chemist Wilhelm Kӧrner (1839-1925) observed in 1974 that each of the three isomers of dibromobenzene, A, B, and C, gave a different number of tribromobenzenes upon further bromination, allowing him to assign their respective structures. Try to do the same and assign structures to A, B, and C based on the following results: A gives two tribromobenzenes in comparable amounts B gives three tribromobenzenes, one of them in minor quantities C gives only one tribromobenzenep-dihydroxybenzene and o-dihydroxybenzene can be separated by TLC using a solvent of medium polarity. The ortho isomer has a significantly higher Rf value than the para isomer. Suggest a reason for this difference in Rf values. (hint- consider the structure of these two molecules)Predict the electronic configurations of (a) the benzeneanion, (b) the benzene cation. Estimate the π-bond energy in each case.
- The 1HNMR signals the alkene protons of three ethylene derivatives with different substitution patterns are shown below. Considering that each of the derivatives contains AT MOST two substituents (X and/or Y) and at least two protons. A) Propose the possible substitution patterns for each of the derivatives based on the observed splitting patterns. Justify your proposals B) How might one differentiate between the three possible isomers of derivative 3 in the question above using 1H NMR spectroscopy? Explain in a sentence – no calculation is needed. C) Give TWO methods that can be used to differentiate between the three possible isomers of derivative 2 in the question above using 1H NMR spectroscopy? Explain in a sentence – no calculation is needed.I am slightly confused on the naming of ethers. How come for chloromethoxymethane, it is not methoxychloride? Isn't chloride more complex than the alkyl group, so it should be placed at the root? Or is it not placed at the root because chloride is not an alkyl group at all?The pKa of cyclopentane is > 60, which is about what is expected for a hydrogen that is bonded to an sp3 carbon. Explain why cyclopentadiene is a much stronger acid (pKa of 15) even though it too involves the loss of a proton from an sp3 carbon.