Chapter 17 Flashcards

(14 cards)

1
Q

conjugated dienes

A

continuous system of overlapping pi bonds

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2
Q

preparation of conjugated dienes

A

from allylic halides via elimination or dihalides via 2 elimination reactions

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3
Q

preparation of conjugated dienes - reagants

A

bulky bases to prevent SN2 reactions

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4
Q

stability - bonds

A

conjugated are more stable

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5
Q

equilibrium conformation

A

trans conformation

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6
Q

Electrophilic addition of dienes

A

addition of HX

produces 2 products 1,2 and 1,4 adducts

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7
Q

Electrophilic addition - production of 2 products

A

first is produced normally, second is produced via resonance structure

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8
Q

Bromination of diene

A

produces 1,2 and 1,4 adducts

addition of BR molecules

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9
Q

Diels - Alder reactions

A

2 carbon bonds are formed simultaneously

favoured by moderate temps

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10
Q

Diels - Alder reactions - high temps

A

disfavours products

achieves reverse diels alder reaction (breaks compound in 2)

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11
Q

Dienophile - substituents

A

adding substituents causes reaction to occur more rapidly

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12
Q

Diene - Diels alder reaction

A

must be cis configuration

if it can be in cis form wont react

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13
Q

Endo

A

syn to the larger bridge
electron withdrawing substituents occupy endo
highly favoured

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14
Q

Exo

A

anti to large bridge

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