E1 and E2 Reactions

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Questions

• What are E2 reactions?
• What are elimination reactions?
• Do E2 reactions change stereochemistry?
• How can I difference between substitution and elimination reactions?
• How do you distinguish between E1 and E2 reactions?
• What favors elimination reactions?
• Are elimination reactions favored at high temperatures?
• Are elimination reactions only organic reactions?
• Do the numbers 1 and 2 in E1 and E2 reactions relate to the number of steps in the elimination reaction's mechanism?
• What is reductive elimination in elimination reactions?
• Why do elimination reactions compete with substitution reactions when alkyl halides react with a nucleophile?
• Why does the elimination of hydrogen halide (a halogen acid) from an alkyl halide require a strong base?
• Which diastereomer of 1-bromo-4-t-butylcyclohexane, the cis or the trans, undergoes elimination more rapidly when treated with sodium ethoxide?
• When 1-iodo-1-methylcyclohexane is treated with #NaOCH_2CH_3# as the base, the more highly substituted alkene product predominates. When #KOC(CH_3)_3# is used as the base, the less highly substituted alkene predominates. Why? What are the structures of the two products?
• Question #d301a
• Question #cd21d
• What is the product of cyclohexanone and cinnamaldehyde?
• Please explain the beta elimination?
• Regarding E2 reactions, predict the stereochemistry of the bromoalkene that would result from the loss of one mol of #HBr# from meso- and from (±)-1,2-dibromo-1,2-diphenylethane. Which reaction should be slower? Why?
• How do i determine the difference between substitution and elimination reaction?
• What is high regioselectivity?
• What is regioselectivity?
• How can you calculate regioselectivity?
• What determines regioselectivity?
• What is Markovnikov regioselectivity?
• What is regioselectivity and stereoselectivity?
• Why is #3^@ > 2^@ > 1^@ > "methyl"# the trend for reactivity in an #"S"_N1# reaction but #3^@ < 2^@ < 1^@ < "methyl"# for #"S"_N2# reactions?
• In reference to carbocations, what do we mean by stability? Are not all carbocations high energy species?
• Question #b6602
• How does #"propylene"# react with #"hydrogen choride"#?
• What should be the major product if 2-methylbuta-1,3-diene is treated with HBr ?
• Question #f9abf