CAS 87121-89-9 corresponds to the compound Ethyl 3-oxocyclobutanecarboxylate, an organic synthesis intermediate containing a four-membered ring ketone structure, with the molecular formula C₇H₁₀O₃ and a molecular weight of 142.15.

Basic Information
- Chinese Name: Ethyl 3-oxocyclobutane carboxylate (Alternative Names: Ethyl 3-oxocyclobutane-1-carboxylate, Ethyl 3-oxocyclobutanoate)
Ethyl 3-oxocyclobutanecarboxylate
- CAS Number: 87121-89-9
- Molecular formula: C₇H₁₀O₃
- Molecular weight: 142.15
- Structural features: The 3-position of the cyclobutanone ring is a carbonyl group, and the 1-position is connected to an ethyl ester group
- Appearance: A pale yellow to colorless, transparent oily liquid
- Density: approximately 1.169 g/cm³
- Boiling point: approximately 90°C (2 Torr) or 206.9°C (at standard pressure, with significant variations in literature)
Flash point: approximately 82.3°C
Storage conditions: Store under inert gas protection at 2-8°C, protected from light and sealed

main purpose
- As pharmaceutical intermediates and organic building blocks, they are widely used in the construction of complex molecular frameworks such as nitrogen-containing heterocycles, tetracyclic diterpenoids, and dopamine agonists
- Its α-active substructure facilitates reactions such as alkylation and condensation, serving as a key precursor for synthesizing drug candidate molecules

Safety Reminder
- GHS Classification: Warning (H315 Skin irritation, H319 Serious eye irritation, H335 Respiratory irritation)
- Wear protective equipment during operation, conduct procedures in a fume hood to avoid inhaling vapors or skin contact

Note: Some sources mistakenly listed its molecular formula as C₆H₁₀O₃ (molecular weight 130.14), which was an incorrect structural identification. The correct structure contains 7 carbon atoms and should be designated as C₇H₁₀O₃.

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CAS 87121-89-9 Ethyl 3-oxocyclobutanecarboxylate
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