Cyclopropyl Methyl Ketone: market notes, specs, and real-world use

If you’ve bought or evaluated Cyclopropyl Methyl Ketone in the past year, you’ve probably noticed two things: supply is steadier than it was post-2022, and QC expectations keep climbing. Honestly, that’s a good thing. This niche ketone—synonym: acetylcyclopropane—has moved from “curiosity” to a practical workhorse in pharma and agro intermediates. I’ve seen labs spec it for scaffold diversification, while pilot plants demand tighter water and aldehyde limits. Trends come and go, but this one is sticking.

Technical snapshot and specs

Short description: Acetylcyclopropane; CAS 765-43-5; MF C5H8O; MW 84.12. Below are typical, lab-verified numbers—real-world use may vary by batch and method.

Where it truly shines

• Pharma intermediates: constrained ring building block; enone and Grignard chemistry with Cyclopropyl Methyl Ketone are popular in discovery.
• Agrochemical R&D: cyclopropyl motif for SAR exploration; clean GC helps avoid false positives.
• Fine chemicals: fragrance precursors and specialty monomers—niche, but it happens.

Process flow, QA, and standards

Material inputs: ring-bearing feedstocks and ketone-forming reagents (details vary by IP). Method: controlled addition, temperature-managed condensation, followed by fractional distillation. To be honest, the distillation cut is where many suppliers win or lose.

Testing protocol (typical):

• Identity: GC-MS and IR; confirmation by 1H/13C NMR (ISO/IEC 17025 lab).
• Assay: GC per USP ; area normalization.
• Water: Karl Fischer per ASTM E203.
• Residual solvents: USP where applicable.
• Stability: 40°C/75% RH accelerated, 3–6 months, then trending. Results we’ve seen: no meaningful drift in GC purity when protected from light.

Case notes from the field

A European CDMO scaled a heteroaryl coupling where Cyclopropyl Methyl Ketone was the masked functionality. Their feedback: “lower peroxide background cut workup time by ~15%.” Another customer in APAC reported fewer batch holds after moving to tighter GC specs (≥99.2%). Small wins, but they add up.

Vendor landscape and customization

Customization usually means: narrower assay (e.g., ≥99.5%), stabilized packaging (nitrogen headspace), or low-odor grade for fragrance screens. Lead times range from quick-ship to 3–4 weeks if you need special drums or retest windows.

Compliance, safety, and packaging

• Quality system: ISO 9001 managed; batch COA with GC, KF, and identity data.
• Regulatory: GHS/CLP labeling; TSCA/REACH status available upon request.
• Packaging: 1–25 kg fluorinated HDPE or amber glass; 200 kg steel drums for bulk. Nitrogen headspace available for Cyclopropyl Methyl Ketone.
• Storage: flammable liquid; keep cool, ventilated, and away from oxidizers.

Final thought: it seems that when buyers press for tighter GC specs and better headspace control, Cyclopropyl Methyl Ketone behaves beautifully across scale. Surprisingly drama-free, which—considering today’s timelines—is refreshing.

References

1. PubChem Compound Summary: Cyclopropyl methyl ketone. https://pubchem.ncbi.nlm.nih.gov/compound/Cyclopropyl-methyl-ketone
2. USP General Chapter Chromatography (reference overview). https://www.usp.org
3. ASTM E203 – Standard Test Method for Water Using Karl Fischer Reagent. https://www.astm.org/e0203
4. OECD Test Guideline 117 (HPLC Method for logP). https://www.oecd.org/chemicalsafety/testing/oecdguidelinesforthetestingo fchemicals.htm
5. ISO 9001:2015 Quality management systems. https://www.iso.org/standard/62085.html