Organic Chemistry
Organic Chemistry
12th Edition
ISBN: 9781118875766
Author: T. W. Graham Solomons, Craig B. Fryhle, Scott A. Snyder
Publisher: WILEY
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Chapter 6, Problem 2LGP

Consider the following sequence of reactions, taken from the early steps in a synthesis of ?-fluorooleic acid, a toxic natural compound from an African shrub. (?-Fluorooleic acid, also called “ratsbane,” has been used to kill rats and also as an arrow poison in tribal warfare. Two more steps beyond those below are required to complete its synthesis.)

(i) 1-Bromo-8-fluorooctane+sodium acetylide (the sodium salt of ethyne) compound A ( C 10 H 17 F )

(ii) Compound A + N a N H 2 compound B ( C 10 H 16 F N a )

(iii) Compound B + I ( C H 2 ) 7 C I compound C ( C 17 H 30 C I F )

(iv) Compound C + N a C N compound D ( C 18 H 30 N F )

(a) Elucidate the structures of compounds A, B, C, and D above.

(b) Write the mechanism for each of the reactions above.

(c) Write the structure of the transition state for each reaction.

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1) The carbon-oxygen double bond present in aldehydes and ketones is very polar. What does this mean and how does it arise? 2) The carbon-oxygen double bond is readily attacked by nucleophiles like cyanide ions or ammonia.           (i) What do you understand by the term nucleophile?           (ii) Which part of the carbon-oxygen double bond is attractive to nucleophiles? 3) Why is there a difference between aldehydes and ketones in their response to oxidizing agents such as potassium dichromate(VI) solution acidified with dilute sulfuric acid?
5) Compound A reacted with Mg in ether to give B. Compound B is with Ethyl bromide to give Ethyl cyclohexane. What are the structures of A and B?
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