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2-Methylaziridine (Propyleneimine) can cause cancer according to an independent committee of scientific and health experts. Propyleneimine, stabilized appears as a clear colorless liquid with an ammonia-like odor. Flash point 25 °F. Toxic by ingestion, inhalation and through skin absorption. Less dense than water. Vapors are heavier than air. Produces toxic oxides of nitrogen during combustion. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. Used as an organic intermediate. 2-Methylaziridine is a member of aziridines. 1,2-Propyleneimine is used as an intermediate in the paper, textile, rubber, and pharmaceutical industries. 1,2-Propyleneimine is severely irritating to the eyes and upper respiratory tract from acute (short-term) inhalation exposure in humans. Headaches, dizziness, nausea, bronchitis, shortness of breath, and edema of the lungs have also been reported in humans. No information is available on the chronic (long-term), reproductive, developmental, or carcinogenic effects of 1,2-propyleneimine in humans. Animal studies have reported effects on the kidneys, blood, and gastrointestinal system from chronic inhalation and oral exposure to 1,2-propyleneimine. Animal studies have reported tumors of the mammary glands and intestines, leukemia, and other tumor types from oral exposure to 1,2-propyleneimine. The International Agency for Research on Cancer (IARC) has classified 1,2-propyleneimine as a Group 2B, possible human carcinogen. EPA has not classified 1,2-propyleneimine for carcinogenicity. Propylenimine is a synthetic, flammable, volatile, colorless oily liquid that is soluble in water, ethanol and most organic solvents. Propylenimine is used in the United States exclusively as an intermediate, and its derivatives are used in the paper, textile, rubber and pharmaceutical industries. Due to its volatility, potential exposure could occur during production, packaging, or use of substances made with this liquid. The primary routes of potential human exposure to propylenimine are inhalation, ingestion and dermal contact. It is reasonably anticipated to be a human carcinogen. (NCI05)

A primary aliphatic amine that consists of cyclopropane bearing a single amino substituent." []

Allylamine, also known as 3-aminopropylene or prop-2-en-1-amine, is classified as a monoalkylamine. Monoalkylamines are organic compounds containing an primary aliphatic amine group. Allylamine is soluble (in water) and a very strong basic compound (based on its pKa). Allylamine is a colorless liquid and is the simplest stable unsaturated amine. Allylamine is used to make pharmaceuticals and other chemicals. Allylamine, like other allyl derivatives is a lachrymator and skin irritant.

Azetidine is a saturated organic heteromonocyclic parent, a member of azetidines and an azacycloalkane.