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Chapter 12: PROBLEM 12.2 (page 458)

Question: What alkane is formed when each alkene is treated with H2 and a Pd catalyst?

a.

b.

c.

Short Answer

Expert verified

Answer

a.

b.

c.

Step by step solution

01

Hydrogenation of Alkenes

Symmetric addition of H2 to the double bond of alkene gives alkane as a product.

Palladium is used as a catalyst in the reaction; it assists in the breaking of 蟺 -bond and formation of 蟽-bond

02

Action of H2 and Pd on alkenes

The double bond is broken, and a hydrogen atom is added on either side of the C=C double bond.

a.

Cleavage of the double bond

b.

Cleavage of the double bond

c.

Cleavage of the double bond

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Most popular questions from this chapter

Question: What carbonyl compound is formed when each alcohol is treated with HCrO4鈥撯�揂mberlyst A-26 resin?

a.

b.

c.

Question: Stearidonic acid (C18H28O2 ) is an unsaturated fatty acid obtained from oils isolated from hemp and blackcurrant (see also Problem 10.11).

a. What fatty acid is formed when Stearidonic acid is hydrogenated with excess H2 and a Pd catalyst?

b. What fatty acids are formed when stearidonic acid is hydrogenated with one equivalent of H2 and a Pd catalyst?

c. Draw the structure of a possible product formed when stearidonic acid is hydrogenated with one equivalent of H2 and a Pd catalyst, and one double bond is isomerized to a trans isomer.

d. How do the melting points of the following fatty acids compare: stearidonic acid; one of the products formed in part (b); the product drawn in part (c)?

Question:Devise a synthesis of (3R,4S)-3,4-dichlorohexane from acetylene and any needed organic compounds or inorganic reagents.

Question: Sodium hypochlorite (NaOCl, the oxidant in household bleach) in aqueous CH3COOH is also touted as a 鈥済reen鈥� oxidizing agent. For example, oxidation of (CH3)2CHOH with NaOCl forms along with NaCl and H2O. (a) What advantages and/or disadvantages does this method have over oxidation with HCrO4鈥撯�揂mberlyst A-26 resin? (b) What advantages and/or disadvantages does this method have over oxidation with CrO3, H2SO4,H2O.

Question: Draw the products formed when both cis- and trans-but-2-ene are treated with a peroxyacid followed by 鈥� OH (in H2O ). Explain how these reactions illustrate that anti-dihydroxylation is stereospecific.

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