3-Cyclopentylpropanoyl chloride is the systematic name for the CAS 104-97-2 acyl chloride also called 3-cyclopentylpropionyl chloride or cyclopentanepropionyl chloride. NIST lists formula C8H13ClO and molecular weight 160.641. Buyers should state the CAS, structure and required analytical limits because shorter search phrases such as “cyclopentyl chloride” or “cyclopropyl carbonyl chloride” refer to different substances.
3-Cyclopentylpropanoyl Chloride CAS 104-97-2: Identity and Sourcing
CAS 104-97-2 identity at a glance
| Preferred systematic name | 3-Cyclopentylpropanoyl chloride |
|---|---|
| Common source-record name | 3-Cyclopentylpropionyl chloride |
| CAS Registry Number | 104-97-2 |
| Molekulare Formel | C8H13ClO |
| Molekulargewicht | 160.641 g/mol |
| InChIKey | SZQVEGOXJYTLLB-UHFFFAOYSA-N |
| Canonical SMILES | ClC(=O)CCC1CCCC1 |
| EC number | 203-257-9 |
Identity sources: NIST Chemistry WebBook: CAS 104-97-2 und PubChem CID 66039.
What is the difference from similarly named chlorides?
The full name matters. CAS 104-97-2 contains a cyclopentyl group connected through two methylene units to an acyl chloride group. A partial-name match does not establish the same structure, reactivity, specification or safety profile.
| Search term | Why it is not enough | Buyer action |
|---|---|---|
| 3-Cyclopentylpropionyl chloride | Common name for the CAS 104-97-2 record | Confirm CAS, systematic name and structure |
| Cyclopentyl chloride | Describes a ring chloride rather than this acyl chloride | Do not treat as a synonym |
| Cyclopropyl chloride | Uses a different, smaller ring and is not the CAS 104-97-2 structure | Do not substitute by keyword similarity |
| Cyclopropyl carbonyl chloride | Has a different ring and carbon skeleton | Verify the requested drawing or SMILES |
| Cyclopentanecarbonyl chloride | Places the carbonyl chloride directly next to the ring rather than after the propanoyl chain | Confirm chain length before quotation |
What is CAS 104-97-2 used for?
CAS 104-97-2 is sold as an acyl chloride and research/synthesis reagent. In a qualified route it may be evaluated as an acylating intermediate for preparing a downstream molecule. That class-level description does not prove suitability for a particular API, electronic material, fragrance, agrochemical, finished product or manufacturing scale.
Before selecting it for a process, define the target transformation, stoichiometry, solvent and water controls, impurity limits, materials compatibility, quench strategy, scale and destination-market requirements. The buyer’s chemists and EHS team must validate the route against the current specification and SDS.
How to interpret external catalog data
A current Thermo Scientific catalog entry for its own CAS 104-97-2 product lists GC assay ≥97.5%, refractive index 1.4630–1.4670 at 20 °C, clear colorless-to-yellow appearance and liquid form. These fields help define questions a buyer may ask, but they are not a Longchang specification, lot result, grade, inventory statement or supply guarantee.
External reference: Thermo Scientific CAS 104-97-2 catalog record.
How to read the legacy Longchang source record
The historical product entry contains the values below. They have no displayed method, date, batch number or current approval status and therefore must not be treated as a current commercial specification.
| Legacy field | Historical value | Qualification action |
|---|---|---|
| Erscheinungsbild | Hellgelbe Flüssigkeit | Request the current color/appearance method and acceptance range |
| Assay | 98%; one historical result row shows 98.20% | Request the current limit, method, basis and applicable lot COA |
| 3-Cyclopentylpropionic acid | Historical result 0.6%; no limit shown | Define the correct analyte name, method and maximum limit |
| Andere Stoffe | Historical result 1.2%; no identities or limit shown | Define named related substances, unknowns, total impurities and method |
| Use field | “API and electronic use” | Treat as an unverified legacy label; validate the exact downstream process and market |
| Verpackung | 50 kg steel drum | Confirm current net weight, lining, closure, moisture protection and transport status |
CAS 104-97-2 RFQ checklist
- State `3-Cyclopentylpropanoyl chloride`, CAS 104-97-2 and, when needed, SMILES `ClC(=O)CCC1CCCC1`.
- Define assay method and basis, appearance/color, water and any route-specific physical-property limits.
- Define limits and methods for 3-cyclopentylpropionic acid, named related substances, unknowns and total impurities.
- State quantity, scale, intended transformation, packaging/lining constraints, destination and required transport documents.
- Request the current supplier specification, applicable lot COA, current SDS status and document versions before qualification.
Safety and handling boundary
A current third-party SDS for CAS 104-97-2 classifies its referenced material as corrosive and capable of causing severe skin and eye damage, with respiratory-irritation warnings. This page is not a substitute for an SDS and does not establish the classification or controls for a Longchang lot. Use the current supplier SDS, local regulations and a site-specific risk assessment for handling, storage, transport, reaction and disposal.
Safety reference: Thermo Fisher SDS search: A17715.
Request current CAS 104-97-2 information
E-Mail info@longchangchemical.com with the product name, CAS, intended transformation, specification, quantity, packaging constraints, destination and document requirements.
Review the CAS 104-97-2 product sourcing page.
Frequently asked questions
Is cyclopentylpropionyl chloride the same as 3-cyclopentylpropanoyl chloride?
For the CAS 104-97-2 record, the former is a common synonym and the latter is the systematic name. Confirm the CAS and structure because shortened names can identify different chlorides.
Does the old 98% field guarantee current assay?
No. It is a historical source-record value without a current method or lot context. Qualification requires the current specification and an applicable lot COA.
Is CAS 104-97-2 an API?
The identity sources establish an acyl chloride chemical record, not API status or suitability for a finished medicine. Any pharmaceutical use or regulatory status must be supported for the specific material, process and market.
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