Experiment 14: grignard rxn synthesis of benzoic acid

In the synthesis of benzoic acid using a Grignard reagent, which compound is commonly used to prepare the Grignard reagent?

alkyl halide

any compound with a suitably acidic hydrogen, including water, will donate a proton and do what to the grignard reagent?

destroy it

In Grignard reagent, carbon is more ____________ (electronegative/electropositive) than metals.

electronegative

The synthesis of the Grignard reagent is an _____________ (endothermic/exothermic) reaction.

exothermic

why do we need to make sure all glassware is dry before we start the reaction?

the ether we are using is moisture sensitive and that's why you want to make sure all glassware are dry before you start any reaction

The carbon atom of Grignard reagent is a powerful ___________ (nucleophile/electrophile) and a strong Lewis _____________ (acid/base)

nucleophile, base

After addition of the dilute HCl to the complete reaction mixture (first step of workup), the __________ (aqueous/organic) layer will contain the final product.

organic

Which of the following reactions are used to make C-C bonds?

Aldol condensation, Diels-Alder reaction, and Synthesis of Benzoic acid from Grignard reagent

why are anhydrous conditions important in the synthesis of benzoic acid wiht a gragnard reagent?

Anhydrous conditions are important in the synthesis of benzoic acid with a Grignard reagent to prevent unwanted side reactions.

In the synthesis of benzoic acid from a Grignard reagent, which reagent is used to introduce the carbon atom into the benzoic acid structure?

CO2

Which of the following reagents is also acting as solvent in preparation of Grignard reagent?

Diethyl ether

crushing the magnesium turnings in this experiment does what?

helps expose fresh magnesium metal to the surface to help it react better and fully

What is the final step in the synthesis of benzoic acid from a Grignard reagent?

hydrolosis of the benzoate salt

What is the role of the Grignard reagent in the synthesis of benzoic acid?

it acts as a nucleophile

why are we using a drying tube in this reaction as well as the septum?

it does not allow atmospheric moisture to enter the reaction vessel

why do we need to saturate the air in the condensor?

it will stop the ether from squirting out of the pipets