Trimethyl orthoformate

Trimethyl orthoformate (TMOF) is an organic compound with the formula C₄H₁₀O₃. It is a colorless liquid that is used in organic synthesis as a reagent for the introduction of the methoxy group.

Structure and properties

Structure of trimethyl orthoformate

Trimethyl orthoformate is the simplest orthoester, consisting of a central carbon atom bonded to three methoxy groups. The presence of these methoxy groups makes it a useful reagent in chemical reactions where the introduction of a methoxy group is desired.

Synthesis

Trimethyl orthoformate can be synthesized by the reaction of methanol with hydrogen cyanide followed by hydrolysis. Alternatively, it can be prepared by the reaction of methyl formate with methanol in the presence of an acid catalyst.

Applications

In organic chemistry, trimethyl orthoformate is used as a protecting group for alcohols and carboxylic acids. It is also employed in the Pinner reaction to form esters from nitriles.

Protecting group

As a protecting group, trimethyl orthoformate can be used to protect hydroxyl groups by converting them into orthoesters. This protection is useful in multi-step synthesis where the hydroxyl group needs to be preserved from unwanted reactions.

Pinner reaction

In the Pinner reaction, trimethyl orthoformate reacts with nitriles in the presence of an acid to form imidates, which can be hydrolyzed to esters. This reaction is valuable in the synthesis of esters from nitriles.

Safety and handling

Trimethyl orthoformate is flammable and should be handled with care. It should be stored in a cool, dry place away from sources of ignition. Proper personal protective equipment should be worn when handling this chemical.

Related pages

• Orthoester
• Methanol
• Pinner reaction
• Protecting group