# Designation of Propionyl Chloride as a List I Chemical
> **Rule** · Final rule. · Published 2026-03-10 · 91 FR 11450
## Document
- **Document number:** 2026-04657
- **Category:** other
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 11450
- **Publication date:** 2026-03-10
## Abstract

The Drug Enforcement Administration is finalizing the control of propionyl chloride as a list I chemical under the Controlled Substances Act (CSA). Propionyl chloride is used in the illicit manufacture of the controlled substances fentanyl, fentanyl analogues, and fentanyl-related substances, and it is important to the manufacture of these substances. This final rule subjects handlers of propionyl chloride to the chemical regulatory provisions of the CSA and its implementing regulations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/03/10/2026-04657/designation-of-propionyl-chloride-as-a-list-i-chemical)
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