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Chapter 11: 3P (page 426)

Question. Give the structure corresponding to each of the following names.

a. trans-2-ethynylcyclopentanol

b. 4-tert-butyldec-5-yne

c. 3,3,5-trimethylcyclononyne

Short Answer

Expert verified

a.

b.

c.

Step by step solution

01

Structure of Alkynes

The following steps have to be followed while naming alkynes,

Find the parent name by choosing the longest carbon chain and give preference to the functional groups. Then add substituents to the appropriate carbon and the alkyne must be mentioned by the suffix -yne.

02

Molecular structures

a. The -OH group is placed on C1 with the ethyne group on C2.

Structure of trans-2-ethynylcyclopentanol

b. The tert-butyl group is located on C4 of the ten-carbon chain.

Structure of 4-tert-butyldec-5-yne

c. The alkyne group is located on C1 with two methyl groups on C3 and one on C5.

Structure of 3,3,5-trimethylcyclononyne

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Most popular questions from this chapter

Question: Identify the lettered compounds in the following reaction schemes. Each reaction sequence was used in the synthesis of a natural product.


a.

b.

Question: When alkyne a is treated with NH2 followed by CH3 , a product having the molecular formula C6H10O is formed, but it is not compound B. What is the structure of the product and why is it formed?

Question: Why is compound X formed in the following reaction instead of its constitutional isomer Y?

Explain the following result. Although alkenes are generally more reactive than alkynes towards electrophiles, the reaction of with but-2-yne can be stopped after one equivalent of has been added.

Question: Draw the enol tautomer of (a) and the keto tautomer of (b).

a.

b.

See all solutions

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