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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 76705Generated: October 23, 2026

3,4-Dihydroisoquinoline

AKOS 213-252 · 3,4-DihydroisoquinoL · 4-DIHYDROISOQUINOLINE · 3,4-Dihydroisoquinoline · Isoquinoline, 3,4-dihydro- · 3,4-Dihydroisoquinoline ,97% · 3,4-Dihydroisoquinoline >=97.5% (GC) · 3,4-DIHYDROISOQUINOLINE ISO 9001:2015 REACH

https://huagongshe.com/en/chemical/76705

3,4-Dihydroisoquinoline molecular structure

Identifiers & Physical Properties

CAS No.3230-65-7
Molecular formulaC9H9N
Average molar mass131.17 g/mol
Monoisotopic mass131.07349929 g/mol
SMILESC1=NCCc2ccccc21
InChIKeyNKSZCPBUWGZONP-UHFFFAOYSA-N
PubChem CID76705
EC No.221-769-0
DTXSIDDTXSID20186037

Chemical & Physical Properties

XLogP1.3
Topological polar surface area12.4
Hydrogen bond donors0
Hydrogen bond acceptors1
Rotatable bonds0
Heavy atoms10
Formal charge0
Complexity140
SpringerMaterials PropertiesChemical shift
Melting point251-254℃
Boiling point241.8±20.0℃ (760 Torr)
Density1.05±0.1 g/cm3 (20 ºC 760 Torr)
Refractive index1.6041 (589.3 nm 30℃)
Flash point91.6±22.6℃
Storage conditions2-8°C
Physical statesolid
pKa (acidity coefficient)5.80±0.20(Predicted)
AppearanceWhite to off-white Solid
InChIInChI=1S/C9H9N/c1-2-4-9-7-10-6-5-8(9)3-1/h1-4,7H,5-6H2
InChIKeyNKSZCPBUWGZONP-UHFFFAOYSA-N
SMILESC1C2=C(C=CC=C2)CCN=1
FDA UNII2K2ZCG3PSZ
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS06
Signal wordDanger
GHS hazard statementsH302-H310-H315-H319
GHS precautionary statementsP262-P280-P301+P312+P330-P302+P352+P310-P305+P351+P338
Hazard symbolsT
Risk statements (R)22-24-36/38
Safety statements (S)26-36/37-45
UN transport numberUN 2811 6.1 / PGII
Water hazard class (WGK)3
Storage class6.1A - Combustible acute toxic Cat. 1 and 2very toxic hazardous materials
Hazard classAcute Tox. 2 DermalAcute Tox. 4 OralEye Irrit. 2Skin Irrit. 2

Safety & Regulations

GHS classificationDangerH302 (97.6%): Harmful if swallowed [Warning Acute toxicity, oral]P262, P264, P264+P265, P270, P280, P301+P317, P302+P352, P305+P351+P338, P316, P321, P330, P332+P317, P337+P317, P361+P364, P362+P364, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 42 reports by companies from 3 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesAcute Tox. 4 (97.6%)
Water hazard class (WGK)3
UN transport numberUN 2811 6.1 / PGII
Risk statements (R)22-24-36/38
Signal wordDanger
GHS pictogramGHS06
Hazard symbolsT
Safety statements (S)26-36/37-45
Storage class6.1A - Combustible acute toxic Cat. 1 and 2very toxic hazardous materials
GHS hazard statementsH302-H310-H315-H319
Hazard classAcute Tox. 2 DermalAcute Tox. 4 OralEye Irrit. 2Skin Irrit. 2
GHS precautionary statementsP262-P280-P301+P312+P330-P302+P352+P310-P305+P351+P338

Applications & Uses

Uses

3,4-Dihydroisoquinoline is derived from 1,2,3,4-Tetrahydroisoquinoline (T293820), which is used as a reagent in the preparation of 4-(1,2,4-oxadiazol-5-yl)piperidine-1-carboxamides as antiproliferative tubulin inhibitors.

Uses

3,4-Dihydroisoquinoline can be used as a reactant to synthesize: 5,6-Dihydro-8H-isoquino[1,2-b]quinazolin-8-one by decarboxylative cyclization reaction with isatoic anhydride using tetrabutylammonium iodide (TBAI). 1-naphtholyl tetrahydroisoquinoline by aza-Friedel-Crafts reaction with various naphthols. 3,4-dihydroisoquinoline pseudo bases, which are employed as starting materials for the preperation of 3-benzazepine derivatives.