1,1-diphenylethanol | Methyldiphenylcarbinol preparing from benzene

1,1-diphenylethanol is an alcohol compound. Two benzene groups are attatched to the same carbon which has -OH group also. 1,1-diphenylethanol is a benzene substituted alcohol compound.


Derive 1,1-diphenylethanol from benzene using Grignard reagents

Like aliphatic ethanols, we can prepare aromatic alcohols. Here we try to make benzene substituted alcohol compound using grignard reagent. In this example IUPAC name is given, then you have to draw the structure of molecule. We can understand this compound is an alcohol because IUPAC name ends with ol part. Two benzene molecules are bonded to a same carbon atom as substitutes (1,1-diphenyl). The root chain has two carbon atoms (eth). Also 1,1-diphenylethanol can be named as 1-Diphenyle-ethane-1-ol.

1,1-diphenylethanol structure

1,1-diphenylethanol | 1,1-diphenyl-ethane-1-ol

Prepare 1,1-diphenylethanol from benzene

You can start your conversion from benzene. Each step of benzene to 1,1-diphenylethanol is explained below.

Preparing chlorobenzene

Chlorobenzene is prepared by the reaction of benzene and chlorine gas ( Cl2 ) in the presence of AlCl3.

Chlorobenzene and magenesium, dry ether reaction

Next, chlorobenzene reacts with magnesium with dry ether and give grignard reagent.


Ethanol to ethanoic acid

Ethanol is oxidized to ethanoic acid by acidic potassium permanganate ( H+ / KMnO4 ).


Ethanoic acid to ethanoyl chloride

Ethanoic acid reacts with PCl3 or PCl5 to give ethanoyl chloride.


Finally grignard reagent and ethanoyl chloride are mixed together and add water. Then 1-Diphenyle-ethane-1-ol forms.


Benzene to 1,1-diphenylethanol

benzene to 1,1-diphenylethanol


Acidity of 1,1-diphenylethanol

1,1-diphenylethanol is an tertiary alcohol. Acidity of 1,1-diphenylethanol is less than ethanol.