Body & Beauty / Compounds / 2-Methylquinoline (quinaldine)

2-Methylquinoline (quinaldine) on your skin: a safety profile

Elevated risk

(People-specific data is limited; this page draws from human adult context.) Quinoline/quinoxaline derivative — parent compound quinoline is IARC 2B (possible carcinogen); hepatotoxic; structurally related to known carcinogens

What is 2-methylquinoline (quinaldine)?

The IUPAC name is 2-methylquinoline.

Also known as: 2-methylquinoline, Quinaldine, Khinaldin, Chinaldine.

IUPAC name
2-methylquinoline
CAS number
91-63-4
Molecular formula
C10H9N
Molecular weight
143.18 g/mol
SMILES
CC1=NC2=CC=CC=C2C=C1
PubChem CID
7060

Risk for people

Elevated risk

Quinoline/quinoxaline derivative — parent compound quinoline is IARC 2B (possible carcinogen); hepatotoxic; structurally related to known carcinogens

Regulatory consensus

1 regulatory bodyhas classified 2-Methylquinoline (quinaldine).

AgencyYearClassificationNotes
PROP_652012carcinogenCalifornia Prop 65 — listed as carcinogen

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where you encounter 2-methylquinoline (quinaldine)

  • Personal Care — fragrance formulations
  • Fragrance — perfume, cologne, scented personal care products, household fragrance products, candles
    Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)

Safer alternatives

Lower-risk approaches that achieve a similar outcome to 2-Methylquinoline (quinaldine):

  • Exposure reduction / process control
    Trade-offs: Requires R&D investment to redesign synthesis routes; may reduce yield or throughput initially; long-term benefits include reduced waste treatment costs, regulatory compliance, and worker safety; 12 Principles of Green Chemistry framework available.
    Relative cost: 1.2-2×

Frequently asked questions

What products contain 2-methylquinoline (quinaldine)?

2-Methylquinoline (quinaldine) appears in: fragrance formulations (Personal care); perfume (Fragrance); cologne (Fragrance).

See 2-Methylquinoline (quinaldine) in the body app

Look up products containing 2-methylquinoline (quinaldine), compare to alternatives, and explore the full data record.

Open in body View raw API data

Sources (1)
  1. PubChem Compound Database (2026) — database

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →