Grinard, Part I Flashcards Preview

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Flashcards in Grinard, Part I Deck (20)
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1

Structure of benzophenone

carbon connected to two benzene rings and double bonded to oxygen

2

Structure of bromobenzene

benzene ring connected to Br

3

Structure of triphenylmethanol

carbon connected to three benzene rings and single bonded to OH

4

Structure of diethyl ether

oxygen connected on both sides to ethane

5

Structure of iodine

I2

6

Structure of hydrochloric acid

HCl

7

Structure of anhydrous sodium sulfate

Na2SO4

8

Structure of magnesium metal

mg

9

Structure of biphenyl

two benzene ring connected to each other

10

Structure of petroleum ether

c5-c6 hydrocarbon mix

11

Structure of isopropyl alcohol

carbon connected to OH and two other Cs

12

Give the balanced equation for the reaction

Bromobenzene + Mg -> Phenylmagnesium bromide

Phenylmagnesium bromide + benzophenone -> triphenylmethanol

13

Describe the side reaction to form biphenyl

Phenylmagnesium bromide + bromobenzene -> biphenyl and MgBr2

14

Why does everything have to be dry?

to prevent the reaction of RMgX + HOH -> RH + MgXOH

15

Give some examples of how the reaction can be initiated

scratching/crushing mg
adding I2 crystal, 1,2-dibromoethane, or PhMgBr
use of ultrasound
heating (limited by BP of ether)

16

How can the side reaction be minimized?

adding bromobenzene slowly

17

Give some examples of the hazards of Et2O

Flammable
Hard to dispense (generates pressure), vaporize in exothermic reactions
Need ice water in condenser
Forms explosive peroxides with air, absorbs moisture with air
Anesthetic in high concentrations

18

How does reaction rate relate to temperature?

reaction rate doubles with every 10*C increase

19

Name the drying agent we will use (in drying tube)

drierite

20

How is H2 gas formed?

The HCl added to neutralize the reaction will react with unused Mg metal, producing the H2 gas