Synthesis

1019. Identify the most reasonable synthetic precursor of 2,6-heptandione (CH3COCH2CH2CH2COCH3).


1036. Which of the following is a good reducing agent?

A. Cl2

B. Na

C. CH4

D. OsO4

1039. Which of the following alkynes could be used to make this ketone selectively?

 

 

A. B.

 

Which set of reagents would be appropriate for the transformation?

 

A. HgSO4, H2O

B. BH3 followed by H2O2 and NaOH

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1045. This optically active cyclopentene undergoes photolytic bromination with N-bromosuccinimide.

 

 

Which hydrogens can be abstracted?

 

1, 2, 3, 4, 5, 6, 7, 8

 

Which hydrogen would be abstracted to form this radical?

 

3,4,8

 

 

3,4,8

 

What are the products when hydrogens 3 and 4 are abstracted?

A.B.C.

D.E.F.

G.H.

 

A, B, C, D, E, F, G, H

Would the products exhibit optical activity?

A. Yes B. No

 

What are the products when hydrogen 8 is abstracted?

A, B, C, D, E, F, G, H

 

Would these products exhibit optical activity?

A. Yes B. No

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1058. What will be the major product of these reactions?

a.

 

A. B.

 

C. D.

 

b.

 

A. B.

 

C. D.

1059. Which of the following molecules will not be a product of these reactions?

a.

 

A. B. C.

 

b.

 

A. B. C.

1060. Which molecules are the major products from these reactions?

a.

 

 

A. B.

 

 

C. D.

 

b.

 

A. B.

 

C. D.


1061. Which molecules are the products of these reactions?

a.

 

A. B. C.

 

 

D.

 

b.

 

A. B.

 

 

C. D.

1064.

A. B. C.

 

D.

a. Which carbonyl compound is the least reactive? B

b. Which carbonyl compound is the most reactive? C



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