d) Give the four basic ring skeletons of triterpenoids. Provide the fourth structure which is not included in the reference. What is the common feature of the four structures? What are their differences? Which is the most commonly occuring ring skeleton?
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- Acrolein and 1,3-cyclohexadiene react in a one-step concerted manner to yield a single product. Give the structure of the product. What kind of reaction is this an example of? In terms of this reaction, how would you classify acrolein? How would you classify 1,3-cyclohexadiene? Hint: acrolein is not a systematic name so you may need to look up its structure if you are not already familiar with it.Write a series of reaction leading to parabromoethylbenzene, beginning with benzene and using other reagents as needed. What isomeric side products might also be formed?Write a series of reactions leading to para-bromoethylbenzene, beginning with benzene and using other reagents as needed. What isomeric side products might also be formed?
- In 1935, J. Bredt, a German chemist, proposed that a bicycloalkene could not have a double bond at a bridgehead carbon unless one of the rings contains at least eight carbons. This is known as Bredt’s rule. Explain why there cannot be a double bond at this position.Draw the structural formulas of compounds A, C, D, E and F and draw the isomer of B, with the explaination on which one would be the major product and why.An important class of substances in organic chemistry are the aliphatic and aromatic hydrocarbons and theirssubstituted derivatives. In this assignment: Remember to take any isomerism and the VSEPR principles into account A) Study the series of ring structures a – d in the figure above. Fill in the IUPAC names for the rings a - d.Are any of these rings aromatic? Can you say something about what aromaticity means chemically? B) Suggest probable IUPAC names of the following substituted hydrocarbon compounds which areshown in skeletal structure: See image b
- (a) One test for the presence of an alkene is to add a smallamount of bromine, which is a red-brown liquid, and lookfor the disappearance of the red-brown color. This test doesnot work for detecting the presence of an aromatic hydrocarbon.Explain. (b) Write a series of reactions leading topara-bromoethylbenzene, beginning with benzene andusing other reagents as needed. What isomeric side productsmight also be formed?Consider the following aromatic compounds a para-substituted compound?, the most reactive towards EAS? an ortho-substituted compound? does not react with RX, FeX3?In 1935, J. Bredt, a German chemist, proposed that a bicycloalkene could not have a double bond at a bridgehead carbon unless one of the rings containsat least eight carbons. This is known as Bredt’s rule. Explain why there cannot be a double bond at this position.
- draw and name two structures that match the description of a trans-dihalocyclopentaneWhat is Resonance Theory? Sate five conclusions that can be drawn from the theory. State the two main experiments that were used to establish the extra stability of the benzene molecule. What are the factors that confer Aromaticity to an organic molecule? i. State the effects of substituents on a benzene derivative towards further aromatic substitution. Based on the above suggest the various types of substituents that can be attached to Benzene. What are the various ways by which alkenes may be synthesized? i. Give two examples each of Unsymmetrical alkenes and reagents. Give two examples of reactions of alkenes that result in Anti-Markonikov’s addition productsIllustrating with equations, indicate how cyclopentene would be converted to tert-butoxycyclopentane