The tetrahydropyranyl ether is a useful protecting group for the protection of alcohols and phenols, offering stability towards strongly basic reaction conditions, organometallics, hydrides, acylating reagents and alkylation reagents. THP ethers are formed under acidic conditions from alcohols and dihydropyran.
Is Tetrahydropyran an ether?
Tetrahydropyran (THP) is the organic compound consisting of a saturated six-membered ring containing five carbon atoms and one oxygen atom. 2-Tetrahydropyranyl (THP-) ethers derived from the reaction of alcohols and 3,4-dihydropyran are commonly used as protecting groups in organic synthesis.
How do I get rid of THP?
To remove THP (protecting a primary -OH in a compound with an additional ester group) you can use Amberlyst -15 as a mild acid reagent.
What is an alcohol protecting group?
A protecting group is a compound that temporarily converts a given functional group into another allowing for performing reactions that are otherwise incompatible with that functional group.
How is tetrahydropyran formed?
The reaction of tertiary 1,4- and 1,5-diols with cerium ammonium nitrate at room temperature gives tetrahydrofuran and tetrahydropyran derivatives in high yield and stereoselectivity. Various fragrant compounds have been synthesized using this method.
Is tetrahydropyran polar?
Information on this page: Normal alkane RI, non-polar column, custom temperature program. References. Notes.
What is THP used for?
Trihexyphenidyl is used to treat symptoms of Parkinson’s disease or involuntary movements due to the side effects of certain psychiatric drugs (antipsychotics such as chlorpromazine/haloperidol).
What is protection in organic chemistry?
A protecting group or protective group is introduced into a molecule by chemical modification of a functional group to obtain chemoselectivity in a subsequent chemical reaction. It plays an important role in multistep organic synthesis.
Why are silyl ethers good protecting groups for alcohols?
This is why silyl ethers make good protecting groups. They are exceptionally stable in base solution. In acid solution, they are easily removed to regenerate the original alcohol. You can even avoid strong acid, because F⁻ ions also react with the silane and regenerate the alcohol.
What are protecting groups in organic synthesis?
What is the name of the compound with the formula TsOH?
p -Toluenesulfonic acid. p-Toluenesulfonic acid ( PTSA or pTsOH) or tosylic acid ( TsOH) is an organic compound with the formula CH3C6H4SO3H. It is a white solid that is soluble in water, alcohols, and other polar organic solvents. The CH 3 C 6 H 4 SO 2– group is known as the tosyl group and is often abbreviated as Ts or Tos.
How can TsOH be converted to p -toluenesulfonic anhydride?
TsOH may be converted to p -toluenesulfonic anhydride by heating with phosphorus pentoxide. This reaction is general for aryl sulfonic acids. ^ Merck Index, 11th Edition, 9459.
How do you deprotect tetrahydropyranyl ether?
Tetrahydropyranyl ethers. THP ethers are formed under acidic conditions from alcohols and dihydropyran. The deprotection is usually performed as an acidic hydrolysis or alcoholysis. Some new methods also allow the protection and deprotection of acid-sensitive molecules by using mild Lewis acids.
What happens when TsOH is heated with phosphorus pentoxide?
Reactions. TsOH may be converted to p-toluenesulfonic anhydride by heating with phosphorus pentoxide. When heated with acid and water, TsOH undergoes hydrolysis to toluene: CH 3 C 6 H 4 SO 3 H + H 2 O → C 6 H 5 CH 3 + H 2 SO 4. This reaction is general for aryl sulfonic acids. See also. Tosyl; Collidinium p-toluenesulfonate; References
