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Explanation & Answer
Attached.
NAME: (your name)
CHEM 242L
SECTION #: (your section #)
UNLV 2020 Summer Session III
GRIGNARD REACTION
Purpose:
The purpose of this laboratory session was to synthesize triphenylmethanol through the
Grignard reaction. The Grignard reagent was obtained from the reaction between
magnesium and bromobenzene in dry diethyl ether which was then reacted with methyl
benzoate to yield the desired product. The product was characterized by IR and NMR
spectroscopy.
Procedure:
Grignard reagent preparation:
10 mL of anhydrous diethyl ether was placed into a 25 mL Erlenmeyer flask. This flask
was used during the preparation of the reagent in further steps whenever the solvent was
required. Separately, in a 10 mL round-bottom flask, 51.4 of magnesium turnings, a spin
vane, a few crystals of iodine, and 2 mL of diethyl were added and gently stirred. A Claisen
head was connected to the flask and one of its open ends (the one directly above the
flask) was sealed off with a rubber septum, while in the other a clean water condenser
was attached to prevent the solvent evaporation. The apparatus was placed on a hot plate
and the water condenser was turned on. Then, 1 mL of diethyl ether and 410.2 mg
bromobenzene was added to a vial. The solution was transferred to the 10 mL round
bottom flask on the heating mantle with the help of a syringe. After 30 minutes passed the
Grignard reagent was prepared while observing the solution turned mil...