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- Which of the following dienes have an s-cis conformation, and which have an s-trans conformation? Of the s-trans dienes, which can readily rotate to s-cis?Bicyclohexadiene, also known as Dewar benzene, is extremely stable despite the fact that its rearrangement to benzene is energetically favored. Explain why the rearrangement is so slow.Cycloheptatrienyl radical (C7H7∙) contains a cyclic, completely conjugated system of π electrons. Is it aromatic? Is it antiaromatic? Explain.
- Examine the following pericyclic reactions. For each reaction, tell whether it is an electrocyclic reaction, a cycloaddition reaction, or a sigmatropic rearrangement.What is the unsaturation of the following molecule?Which of the following carbocations is(are) likely to rearrange? a. I b. II c. III d. II and III e. I and II
- Is the following alkene E,Z, or neither? a. E b. Z c. neither d. It is one or the other, but which is impossible to determine from the information givenCarbocations are carbons bearing a formal positive charge. a. Carbocations can be stabilized by induction and hyperconjugation. Explain each of these forms of stabilization.If a trans alkene is reacted with OsO4 in H2S, the product is: Meso compound Hoffman product Markovnikov product Racemic mixture When 2-methylpropene is reacted with HCl in ether, the product is: 1-chloro-2-methylpropane 2-chloro-2-methylpropane 2-chloromethylpropene 3-chloro-2-methylpropane Which of the following is not true for the hydroboration reaction of alkenes? Anti-markovnikov Syn addition No incorporation of solvent rearrangements are observed
- Is the structure, transition state and relative stereochemistry of the products is correct? Is the curly arrow mechanism is correct ?For the following dienes, identify whether the molecules has any cis or trans stereochemistry and idenfity the conformation as either s-cis or s-trans, where appropriate. Please also note whether the compound would be reactive in a Diels -Alder reactionWhich of the following statements about cycloaddition reactions is not true? Cycloaddition reactions form a cyclic product with two new bonds. The course of the reaction is determined by the symmetry of the molecular orbitals of the products. Cycloaddition reactions are concerted. Cycloaddition reactions are stereospecific.