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Chapter 9: Q. 9-9-3P-b (page 265)

What products would you expect from the following reactions?

b.

Short Answer

Expert verified

In this, the alkyne is converted to an alkene by halogenation. The three out of one triple bond is broken for the addition of halide, but the halogen and hydrogen are always added in trans geometry.

Step by step solution

01

Markovnikov reactions

In this, the alkyne is converted to an alkene by halogenation. The three out of one triple bond is broken for the addition of halide, but the halogen and hydrogen are always added in trans geometry.

02

Reaction of alkyne with an alkyl halide

When alkyne reacts with an alkyl halide, they undergo different reactions to form a halogen-substituted alkene. Alkyne follows Markovnikov regiochemistry in which one halogen atom and one hydrogen atom are always added in a trans relationship with each other.

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Most popular questions from this chapter

The of acetone, pkaof acetone, CH3COCH3is 19.3. Which of the following bases is strong enough to deprotonate acetone?

(a)KOH (pkaof H2O 15.7)

What products would you expect from the following reactions?

a. CH3CH2CH2C≡CH+Cl2

Occasionally, a chemist might need to invert the stereochemistry of an alkene—that is, to convert a cis alkene to a trans alkene, or vice versa. There is no one-step method for doing an alkene inversion, but the transformation can be carried out by combining several reactions in the proper sequence. How would you carry out the following reactions?

(a)tran-5-decene→?cis-5-decene

(b)cis-5-decene→?trans-5-decene

How would you prepare the following carbonyl compounds starting from an alkyne (reddish-brown Br)?

b.

Let be a group and assume that for each positive integer i , Ni is a normal subgroup of G. If every element of can be written uniquely in the form ni1 .ni2 ...nikwith i1 < i2 < ... < ik and nij∈Nij , prove that G≅∑i=1 Ni (see Exercise 34). [Hint: Adapt the proof of Theorem 9.1 by defining f(a1, a2...) to be the product of those ai that are not the identity element.]
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