Trihexylphenedyl Property

Melting point:

258.5°C

Boiling point:

442.59°C (rough estimate)

Density 

0.9941 (rough estimate)

refractive index 

1.5614 (estimate)

pka

14.31±0.29(Predicted)

NIST Chemistry Reference

Trihexyphenidyl(144-11-6)

Safety

Hazardous Substances Data

144-11-6(Hazardous Substances Data)

Toxicity

LD50 ipr-mus: 150 mg/kg ARZNAD 21,1727,71

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H301Toxic if swalloed

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P301+P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P321Specific treatment (see … on this label).

P330Rinse mouth.

P405Store locked up.

P501Dispose of contents/container to..…

Trihexylphenedyl Chemical Properties,Usage,Production

Originator

Artane,Lederle,US,1949

Uses

Trihexyphenidyl, an antiparkinsonian drug, possesses central and peripheral anticholinergic actions, as well as a direct relaxant effect on smooth muscle. It reduces muscle rigidity and general stiffness, and has a relatively minor effect on tremors. It is used in Parkinsonism in the form of monotherapy as well as in combination with levodopa.

Uses

Anticholinergic; antiparkinsonian.

Definition

ChEBI: Trihexyphenidyl is an amine.

Manufacturing Process

Acetophenone, paraformaldehyde and piperidine are first reacted to give ω-(1- piperidyl)propiophenone. To an absolute ethyl ether solution of cyclohexylmagnesium bromide (prepared from 261 parts of cyclohexyl bromide, 38.8 parts magnesium turnings and 700 parts by volume absolute ethyl ether) a dry solution of 174 parts omega-(1-piperidyl)-propiophenonein 600 parts by volume of ether is added, with stirring, at such a rate that gentle reflux is maintained with no external cooling or heating. The reaction mixture is stirred for about 5 hours and then allowed to stand at room temperature until reaction appears complete. While being cooled the reaction mixture is then decomposed by the dropwise addition of 500 parts by volume of 2.5 N hydrochloric acid, and finally is made strongly acidic to Congo red by the addition of concentrated hydrochloric acid.
The resulting white solid is collected on a filter, air dried, redissolved in 2,500 parts water at 95°C and the resulting solution treated with decolorizing charcoal and clarified by filtration. The cooled filtrate is made alkaline with ammonia and the product, crude 3-(1-piperidyl)-1-cyclohexyl-1-phenyl-1- propanol is collected. The hydrochloride melts with decomposition in ten seconds in a bath held at 258.5°C. The alcohol melts at 114.3° to 115.0°C, according to US Patent 2,716,121.

brand name

Artane (Lederle); Tremin (Schering).

Therapeutic Function

Antiparkinsonian

Safety Profile

Poison by intraperitoneal, subcutaneous, and intravenous routes. When heated to decomposition it emits toxic fumes of NOx.

Synthesis

Trihexyphenidyl, 1-cyclohexyl-1-phenyl-3-piperidineopropan-1-ol (10.2.2), is synthesized by the reaction of 2-(1-piperidino)propiophenone (10.2.1) with cyclohexylmagnesiumbromide. The initial 2-(1-piperidino)propiophenone is synthesized in turn by the aminomethylation of benzophenone using paraformaldehyde and piperidine [24¨C27].