When propenal is treated with sodium acetylide, aproduct is formed whose IR spectrum exhibits a broadabsorption between 3200 and 3600 cm¯1, but showsno absorption near 1700 cm-1. (a) Draw the structureof the product. (b) Argue whether the nucleophile addsreversibly or irreversibly to the carbonyl group.CHHC||CH21. HC=CNa?2. NH,CI

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Answered: When propenal is treated with sodium…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter9: Nucleophilic Substitution And Β-elimination

Section: Chapter Questions

Problem 9.31P

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OH - NH, Br2/KOH →product; 1. (a-hydroxy amide) Product of this Hoffmann bromamide reaction is : OH (a) Ph – Ĉ-CH3 (Ъ) Ph — CHO (c) Ph- CH3 (d) Ph – CH2 -NH2 NO2
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4. Protonation of alcohol A and subsequent loss of water, produces the intermediate B. CH3 CH; CH, CH, — с — сH, CH, CH;CH, - C- CH, CH; | OH A B (a) (i) Name alcohol A. (11) What type of species is intermediate B? (iii) Draw the structures of the two alkenes which can be formed from species B by removal of a proton. Label as C the alkene which shows geometrical isomerism. (b) The intermediate B is readily attacked by nucleophiles such as water. What is the essential feature of a nucleophile? (c) State what final colour you would see if alcohol A were warmed with acidified potassium dichromate(VI). Explain your answer. Colour Explanation . (ii) Draw two structural isomers of alcohol A which form branched chain ketones when heated with acidified potassium dichromate(VI), but which could not form alkene C on dehydration.
The enamine prepared from acetone and dimethylamine is shown here in its lowest-energy form. (a) What is the geometry and hybridization of the nitrogen atom? (b) What orbital on nitrogen holds the lone pair of electrons? (c) What is the geometric relationship between the p orbitals of the double bond and the nitrogen orbital that holds the lone pair? Why do you think this geometry represents the minimum energy?
If anhydrides react like acid chlorides with the nucleophiles, draw the products formed when each of the following nucleophiles reacts with benzoic anhydride [(C6H5CO)2O]: (a) CH3MgBr (2 equiv), then H2O; (b) LiAlH4, then H2O; (c) LiAlH[OC(CH3)3]3, then H2O.

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