Ch 17 Conjugated PI systems and Pericyclic Reactions

Question 1

Cumulated dienes

Answer 1

Also called Allene’s, the pi bonds are adjacent

Question 2

Conjugated dienes

Answer 2

The pi bonds are separated by exactly one sigma bond

Question 3

Isolated dienes

Answer 3

The pi bonds are separated by two or more sigma bonds

Question 4

Conjugated dienes can be prepared from ally lick halides via elimination process with_______.

Answer 4

t-BuOK. Conjugated dienes can be formed from dial ides via two successive elimination reactions

Question 5

S-cis conformation

Answer 5

Pic

Question 6

S-trans conformation

Answer 6

Pic,dihedral angel of 180,more stable, equ favors

Question 7

The addition of HX across an alkene is regiochemicl and will be added to —–

Answer 7

The more substituted position ,markovikov addition

Question 8

When butadiene is treated with HBr will produce _____ major products

Answer 8

Two major products,1,2-addition and 1,4-addition

Question 9

Kinetic control

Answer 9

Def

Question 10

Thermodynamic control

Answer 10

Def

Question 11

Dienes are compouds that posses _____ Carbon carbon double bonds

Answer 11

Two