91影视

Use what the curved arrows tell you about electron movement to determine the product(s) of each reaction step.

Question: Draw the isomers for the following compounds and then name each one:

a. 2-methyl-2,4-hexadiene

b. 2,4-heptadiene

c. 1,3-pentadiene

Question: Which of the following are electrophiles, and which are nucleophiles?

Question: Identify the nucleophile and the electrophile in the following acid鈥揵ase reactions:

Draw the products that would be obtained by following the incorrect arrows in the box entitled 鈥淎 Few Words about Curved Arrows鈥� and explain what is wrong with the structures you obtain.

Question: Draw the products that would be obtained by following the incorrect arrows in the box entitled 鈥淎 Few Words about Curved Arrows鈥� and explain what is wrong with the structures you obtain

Question: a. Which of the monosubstituted cyclohexanes in Table 3.9 on p. 128 has a negative 鈭咷掳 for the conversion of an axial-substituted chair conformer to an equatorial-substituted chair conformer?

b.Which monosubstituted cyclohexane has the most negative 鈭咷掳 for this conversion?

c. Which monosubstituted cyclohexane has the greatest preference for an equatorial position?

d. Calculate 鈭咷掳 for the conversion of 鈥渁xial鈥� methylcyclohexane to 鈥渆quatorial鈥� methylcyclohexane at 25 掳C.

Draw curved arrows to show the movement of the electrons in the following reaction steps.

a. Calculate the percentage of isopropylcyclohexane molecules that have the isopropyl substituent in an equatorial position at equilibrium. (Its 鈭咷掳 value at 25 掳C is -2.1 kcal/mol.)

b. Why is the percentage of molecules with the substituent in an equatorial position greater for isopropylcyclohexane than for fluorocyclohexane?

a. For which reaction in each set will 鈭哠掳 be more significant?

b. For which reaction will 鈭哠掳 be positive?