Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Testing Status of 1-Butyl-1-methylpyrrolidinium Chloride M030021


CASRN: 479500-35-1

Formula: C9-H20-Cl-N

Synonyms/Common Names

  • pyrrolidinium, 1-butyl-1-methyl-, chloride (1:1);1-butyl-1-methyl-2,3,4,5-tetrahydropyrrole Chloride;

Known Uses

Investigated as replacements for volatile organic solvents in industrial and laboratory processes because they are thought to be "environmentally benign." Future consumer products that may contain ionic liquids include batteries, fuel cells, solar cells and electrochromic devices, plastics plasticized with ionic liquids, and surgical implants.

Chemical Properties

Toxicity Effects (HSDB)

Genetic Toxicology

  • Micronucleus  (G03021B)  Completed 
    • Mice: B6C3F1
    • Male Negative 
    • Female Negative 
  • Micronucleus  (G03021)  Completed 
    • Rats: Harlan Sprague-Dawley
    • Male Positive 
    • Female Negative