Question

We preformed an Grignard Reaction in Organic Chemistry lab.

Benzophenone + Phenylmagnesium Chloride (2M in THF) + Diethyl Ether -> triphenylmethanol

This may help:

H2C 8 MOCI H3COH КсHз - MgCI + H2CCH3 MCH3 tertiary alcohol When a reaction between the Grignard reagent used in Experiment 10 (benzylmagnesium chloride) and residual acetone left in the conical vial used in the reaction, the product formed is the tertiary alcohol as shown above. 8-MCI OH MY + MgOHCI benzene When a reaction between the Grignard reagent used in Experiment 10 (benzylmagnesium chloride) with water, the Grignard reagent gets quenched to give benzene (hydrocarbon) product as shown above.

Below are IRs of Benzophenone and Trimethylmethanol. We performed a Grignard reaction to get an alcohol product from a ketone. I am having trouble with the peaks. They do not look great and the sample IR on the Benzophenone's Ketone peak is not where I would expect. Please help me characterize this. Note: We were unable to perform under completely dry conditions but used 2x Ph-MgBr to dry. The last IR is the IR of our product which we need to characterize in comparison to the two stock IRs.

Answer 1

Е # for bшгорилоnk » ph-i-pe IR peaks @ 1648.46 -[c=o (conjugation) , on est spretra 01592.90 – 1447.06 = [aromatic sy ② in 3100 unt= c-h (stretching / D In last spectra © 1655169 em-se cao (conj) o 1594.85–1447002 = cromatáč (c=sjų, 6 305880 chit= c-H stretching. = arou CM3 # Second speelza :- for :- og har en 0 3455082 ant 0-ih stretch (H-bonded) Ø 3059.76 at an . ~3025508 cunt = 4 c-h stretch O 1596098 – 1444.25 - cze (aromatic) o 1179.09 unt - Cro (stretching Thanks! Please al