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Other names 1,2,3,4-Tetrahydroisoquinoline
CAS number 91-21-4
RTECS number NX4900000
SMILES c1ccc2CCNCc2c1
Molecular formula C9H11N
Molar mass 133.19 g/mol
Appearance Deep yellow liquid
Density 1.05 g/mL
Melting point

-30 °C

Boiling point

235-239 °C

EU classification Irritant (Xi)
R-phrases R36/37/38
S-phrases S26 S36
Flash point 99 °C (closed cup)
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Tetrahydroisoquinoline is a secondary amine with the chemical formula C9H11N.


Like other secondary amines, tetrahydroisoquinoline can be oxidized to the corresponding nitrone using hydrogen peroxide, catalyzed by selenium dioxide.[1]


The tetrahydroisoquinoline skeleton is commonly encountered in quaternary ammonium muscle relaxants.


  1. ^ S.-I. Murahashi and T. Shiota (1987). "Selenium dioxide catalyzed oxidation of secondary amines with hydrogen peroxide. Simple synthesis of nitrones from secondary amines". Tetrahedron Letters 28 (21): 2383-2386. doi:10.1016/S0040-4039(00)96130-6.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tetrahydroisoquinoline". A list of authors is available in Wikipedia.
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