Polyol-ester precursors
Industrial references identify heptanoic acid as an intermediate for polyol ester lubricants. [3]
01
THE ESSENTIALS
Heptanoic Acid in 30 Seconds
Its six-carbon alkyl group ends in one carboxyl group. It is achiral and has no geometric double-bond isomer to specify.
Heptanoic acid is the seven-carbon saturated free acid also called enanthic acid. It is a useful precursor when the target requires a heptanoyl residue. [1] [3]
Safety at a glance — Merck 807582 identifies severe skin burns and eye damage, harmful inhalation, and respiratory irritation. TCI H0030 additionally lists possible drowsiness or dizziness and aquatic harm. Use the classification and handling instructions for the selected product. [4] [5] [6]
A condensed structural formula keeps the functional groups visible. [1]
02
GO A LITTLE DEEPER
Understanding Heptanoic Acid
THE SIMPLE EXPLANATION
The functional groups
Its six-carbon alkyl group ends in one carboxyl group. It is achiral and has no geometric double-bond isomer to specify. [1]
A LITTLE DEEPER
What the structure changes
The acid can form heptanoate salts or undergo esterification. A titration measures acid equivalents, whereas GC assesses chromatographically detected composition; other acidic impurities can prevent the two assays from meaning the same thing. [1] [12]
Technical detail Identity, dissociation & specification
The formula and connectivity describe the neutral, straight-chain free acid. A numeric pKa is omitted because the retrieved evidence does not establish a sufficiently defensible condition-labelled field. [1] [2] [4] [5] [6]
Acid–base reference values describe equilibria under specified conditions. They are not a substitute for a validated formulation or an assay on the purchased lot.
03
MAKE THE CONNECTION
How Heptanoic Acid Compares
Similar names and functional groups do not mean interchangeable chemicals.
SIDE-BY-SIDE COMPARISON
Heptanoic Acid vs Hexanoic Acid
Saturated aliphatic monocarboxylic acid
versusSaturated aliphatic monocarboxylic acid
Fixed comparison for this prototype. Acid selectors are disabled; additional comparisons are coming later.
| Property | Heptanoic Acid | Hexanoic Acid |
|---|---|---|
| Molecular formula | C₇H₁₄O₂ [1] | C₆H₁₂O₂ [7] |
| Molecular weight | 130.18 g/mol [1] | 116.16 g/mol [7] |
| Carbon atoms | 7 [1] | 6 [7] |
| Carboxyl groups | 1 [1] | 1 [7] |
| Structure | CH₃–(CH₂)₅–COOH [1] | CH₃–(CH₂)₄–COOH [7] |
| Chemical family | Saturated aliphatic monocarboxylic acid [1] | Saturated aliphatic monocarboxylic acid [7] |
| Identity focus | Free acid; liquid at 20 °C [1] | Free acid; liquid at 20 °C [7] |
Chemical identities are compared here; supplier grades, concentrations, and stereochemical specifications are separate purchasing attributes. pKa values retain their stated conditions; no quantitative solubility ranking is implied.
When Might You Choose One Instead of the Other?
Choose by the required carbon framework. Heptanoic acid supplies the odd seven-carbon acyl residue; hexanoic acid supplies six carbons. Confirm the derivative identity and the process impurity profile rather than selecting by supplier headline purity. [1] [3] [7]
Specified starting material
Heptanoic Acid
Match CH₃–(CH₂)₅–COOH and the method’s required chemical form.
Hexanoic Acid
Match CH₃–(CH₂)₄–COOH; verify the identity before substituting a related acid.
Before choosing: match the reaction or formulation, then verify the exact form, grade, assay basis, and impurities. These contexts do not establish suitability for an industrial or regulated application.
04
FROM STRUCTURE TO APPLICATION
What Is Heptanoic Acid Used For?
Polyol-ester precursors
Industrial references identify heptanoic acid as an intermediate for polyol ester lubricants. The ester product supplies the lubricant performance; the free acid is the precursor. [3]
Metal-salt precursors
Compiled references describe heptanoic acid as an intermediate for metal salts used in plastics manufacture and greases. A heptanoate salt is not commercially interchangeable with the free acid. [3]
06
SOURCE WITH CONTEXT
Heptanoic Acid Suppliers
Compare specific products and package options. Listings are not ranked recommendations.
3 suppliers · 3 products · 6 package listingsLatest supplier check: October 3, 2026
Package sizes stay grouped under the supplier product. Assay methods, product forms, and regional markets remain visible. TCI H0030 lists minimum 98.0% neutralization titration but minimum 96.0% GC. Do not rewrite that as 98% GC. Match water limits and the required assay method before comparing the Wako capillary-GC or Merck GC-area products.
Scroll horizontally if needed. Supplier and package identity stay visible.
| Supplier | Product / Grade | Purity / Assay | Package Size | Public Price | Normalized Price | Documentation | Last Checked | Action |
|---|---|---|---|---|---|---|---|---|
| TCI AmericaHeptanoic Acid | Named grade not statedH0030 · 25 mLFree acid; GC and neutralization titration are separate specifications where both are listed. | GC: minimum 96.0% Neutralization titration: minimum 98.0% | 25 mL | $17.00USD · US public price | Not comparedGrades, assay bases, or forms differ | Document notes: TCI America
| View Product: TCI America, H0030 · 25 mL (opens new tab) | |
| Named grade not statedH0030 · 500 mLFree acid; GC and neutralization titration are separate specifications where both are listed. | GC: minimum 96.0% Neutralization titration: minimum 98.0% | 500 mL | $50.00USD · US public price | Not comparedGrades, assay bases, or forms differ | View Product: TCI America, H0030 · 500 mL (opens new tab) | |||
| Sigma-Aldrich / MerckHeptanoic Acid | For synthesis8075820100The Analysis Note identifies GC area percentage. No mass-fraction equivalence is inferred. | 99.0% minimum (GC area %, a/a) | 100 mL | $47.00USD · US public price | Not comparedGrades, assay bases, or forms differ | Document notes: Sigma-Aldrich / Merck
| View Product: Sigma-Aldrich / Merck, 8075820100 (opens new tab) | |
| For synthesis8075820500The Analysis Note identifies GC area percentage. No mass-fraction equivalence is inferred. | 99.0% minimum (GC area %, a/a) | 500 mL | $58.20USD · US public price | Not comparedGrades, assay bases, or forms differ | View Product: Sigma-Aldrich / Merck, 8075820500 (opens new tab) | |||
| FUJIFILM WakoHeptanoic Acid | Wako Special Grade084-00182Research / further manufacturing; Japan stock listing does not confirm US availability. | 98.0+% (capillary GC) | 25 mL | $44.00USD · US catalog list price | Not comparedGrades, assay bases, or forms differ | Document notes: FUJIFILM Wako
| View Product: FUJIFILM Wako, 084-00182 (opens new tab) | |
| Wako Special Grade088-00185Research / further manufacturing; Japan stock listing does not confirm US availability. | 98.0+% (capillary GC) | 500 mL | $80.00USD · US catalog list price | Not comparedGrades, assay bases, or forms differ | View Product: FUJIFILM Wako, 088-00185 (opens new tab) |
TCI America
Heptanoic Acid
Neutralization titration: minimum 98.0%
Named grade not stated
Free acid; GC and neutralization titration are separate specifications where both are listed.
25 mL
H0030 · 25 mL- Public price
- $17.00USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
500 mL
H0030 · 500 mL- Public price
- $50.00USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
Documentation
Document notes: TCI America
- A product-specific certificate retrieval option was visible; no lot certificate was reviewed. Open the product page and use its certificate section.
- A current regional SDS was not verified in this pass.
- Origin-document availability was not verified. Country of origin is unverified and is not inferred.
Last checked:
Sigma-Aldrich / Merck
Heptanoic Acid
For synthesis
The Analysis Note identifies GC area percentage. No mass-fraction equivalence is inferred.
100 mL
8075820100- Public price
- $47.00USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
500 mL
8075820500- Public price
- $58.20USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
Documentation
Document notes: Sigma-Aldrich / Merck
- A product-specific certificate retrieval option was visible; no lot certificate was reviewed. Open the product page and use its certificate section.
- A current regional SDS was not verified in this pass.
- Origin-document availability was not verified. Country of origin is unverified and is not inferred.
Last checked:
FUJIFILM Wako
Heptanoic Acid
Wako Special Grade
Research / further manufacturing; Japan stock listing does not confirm US availability.
25 mL
084-00182- Public price
- $44.00USD · US catalog list price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
500 mL
088-00185- Public price
- $80.00USD · US catalog list price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
Documentation
Document notes: FUJIFILM Wako
- A product-specific certificate retrieval option was visible; no lot certificate was reviewed. Open the product page and use its certificate section.
- A current regional SDS was not verified in this pass.
- Origin-document availability was not verified. Country of origin is unverified and is not inferred.
Last checked:
Documentation evidence
COA = Certificate of Analysis · SDS = Safety Data Sheet · COO = Certificate of Origin.
Lookup means a retrieval option was visible, not that a lot certificate was reviewed. Check supplier means availability or the applicable document was not verified.
Prices may vary by quantity, account, contract, geography, and availability. These products have different grades, assay bases, or forms; no normalized comparison is shown. Foreign-market prices are reference listings only. No currency conversion, mass-to-volume conversion, or ranking is applied. Confirm equivalent specifications and a current quote before comparison. [4] [5] [6]
Verification limits & placement policy
pKa: CONFLICT UNRESOLVED. HSDB cites 4.4, 4.893 and 4.8 at 25 °C to different references. Same acid; conditions and methods insufficient to explain spread. Omitted from the main pKa field and comparisons. Melting reference: CONDITION-DEPENDENT. NIST includes older fusion measurements with larger uncertainties and a distinct triple point. Selected individual fusion result is labelled by source and uncertainty; no purity-based explanation for supplier differences is asserted.
Only the displayed identity, specification, packages, public prices and stated documentation evidence were reviewed. Current stock, lead times, shipping eligibility, contract pricing, lot certificates, and regulatory suitability are unverified.
There are no paid placements. Future paid listings will show “Sponsored” in both views; payment will not determine chemistry interpretation or imply a ranking.
07
PLAN A LARGER ORDER
Need Heptanoic Acid in Bulk?
Turn your requirements into a clear supplier brief.
Bulk RFQ feature — coming soon. Prototype form: submissions are not currently sent to suppliers. Use sample details to prepare an on-screen brief.
Prepare a bulk request Prototype form
08
A BUYER’S CHECKLIST
Before You Buy Heptanoic Acid
Selections remain only while this page is open.
09
FOR YOUR REFERENCE
Heptanoic Acid Technical Reference
Identity, product reference properties, and handling context.
Identification Names, formula & identifiers
- Principal CAS
- 111-14-8
- Identity focus
- Free acid; liquid at 20 °C
- Formula
- C₇H₁₄O₂
- Molecular weight
- 130.18 g/mol
- IUPAC name
- heptanoic acid
- Connectivity SMILES
- CCCCCCC(=O)O
- Identity SMILES
- CCCCCCC(=O)O
- InChI
- InChI=1S/C7H14O2/c1-2-3-4-5-6-7(8)9/h2-6H2,1H3,(H,8,9)
- PubChem CID
- 8094
Connectivity SMILES describes connectivity; it is not an independent stereochemical assignment. CAS and product-form distinctions are supported by the supplier listings. [1] [4] [5] [6]
Physical Properties Product references & conditions
Liquid at 20 °C. Literature fusion results and supplier melting references are not interchangeable with a guaranteed lot melting specification. [13] [14] [5]
- Melting reference
- 266.0 K (−7.15 °C); Adriaanse et al. (1964), NIST TRC assigned uncertainty 0.05 K [13]
- Boiling reference
- 495 ± 3 K (about 222 ± 3 °C); NIST compiled boiling-point average [13]
- Water solubility
- 2.82 g/L at 25 °C; HSDB attribution to AQUASOL (1992) [14]
- Product density
- 0.92 g/cm³ at 20 °C; Merck 807582 product reference [5]
Hydrate, concentration, stereoisomer, and temperature can change the relevant specification. Product reference data are not a reviewed lot certificate.
Acid/Base Properties Verified values & missing data
A numeric pKa was not verified for the selected identity in this review; no value is inferred. [2]
pKa: CONFLICT UNRESOLVED. HSDB cites 4.4, 4.893 and 4.8 at 25 °C to different references. Same acid; conditions and methods insufficient to explain spread. Omitted from the main pKa field and comparisons. Melting reference: CONDITION-DEPENDENT. NIST includes older fusion measurements with larger uncertainties and a distinct triple point. Selected individual fusion result is labelled by source and uncertainty; no purity-based explanation for supplier differences is asserted.
Temperature, ionic strength, and the use of activities versus concentrations matter in quantitative work. These reference values are not buffer recipes.
Safety at a Glance Product-specific hazards
Merck 807582 identifies severe skin burns and eye damage, harmful inhalation, and respiratory irritation. TCI H0030 additionally lists possible drowsiness or dizziness and aquatic harm. Use the classification and handling instructions for the selected product. [4] [5] [6]
Hazard classifications can vary by concentration, product, supplier and jurisdiction. Review the SDS for the exact product before handling. This summary does not replace the SDS.
Supplier safety information and SDS retrieval (opens new tab)
A product-page safety classification is not verification of every regional SDS. Confirm product code, chemical form and current local document.
Review supplier documentation10
COMMON QUESTIONS
Heptanoic Acid FAQ
What distinguishes Heptanoic Acid?
Its six-carbon alkyl group ends in one carboxyl group. It is achiral and has no geometric double-bond isomer to specify. [1]
How does it differ from Hexanoic Acid?
Adding one methylene group to hexanoic acid changes a hexanoyl residue into a heptanoyl residue. Neither a similar pKa nor a matching assay percentage would make those target structures equivalent. [7]
What must a buyer specify?
TCI H0030 lists minimum 98.0% neutralization titration but minimum 96.0% GC. Do not rewrite that as 98% GC. Match water limits and the required assay method before comparing the Wako capillary-GC or Merck GC-area products. [4]
Are the listed products directly price-comparable?
No. The table retains differing grades, assay bases, forms, and markets. No normalized ranking or currency conversion is applied. [5]
What reference data still need checking?
pKa: CONFLICT UNRESOLVED. HSDB cites 4.4, 4.893 and 4.8 at 25 °C to different references. Same acid; conditions and methods insufficient to explain spread. Omitted from the main pKa field and comparisons. Melting reference: CONDITION-DEPENDENT. NIST includes older fusion measurements with larger uncertainties and a distinct triple point. Selected individual fusion result is labelled by source and uncertainty; no purity-based explanation for supplier differences is asserted.
Can I request a bulk quote here?
The RFQ is a prototype that prepares an on-screen brief. Nothing is sent to suppliers. Confirm actual bulk terms directly with the supplier.
11
TRACE THE INFORMATION
Sources & Editorial Notes
Identity and compiled reference values are separated from supplier-specific specifications. Structural comparisons and buyer guidance are editorial interpretation. Sources were checked October 3, 2026; supplier information can change.
- PubChem · chemical identity (opens new tab)
Neutral molecular identity verified independently through PUG REST; CAS also checked on all selected supplier products.
- PubChem / HSDB · dissociation references (opens new tab)
No numeric field promoted: insufficient conditions or unresolved conflicting records.
- PubChem / HSDB · application references (opens new tab)
Attributed application records reviewed claim by claim. Free acid, intermediate, derivative and biological context are distinguished.
- TCI America · commercial product (opens new tab)
Direct product checked October 3, 2026. Identity, listed assay methods, packages, market, prices and documentation interfaces inspected. Lot certificates and stock are not verified.
- Sigma-Aldrich / Merck · commercial product (opens new tab)
Direct product checked October 3, 2026. Identity, listed assay methods, packages, market, prices and documentation interfaces inspected. Lot certificates and stock are not verified.
- FUJIFILM Wako · commercial product (opens new tab)
Direct product checked October 3, 2026. Identity, listed assay methods, packages, market, prices and documentation interfaces inspected. Lot certificates and stock are not verified.
- Hexanoic Acid · identity (opens new tab)
Primary structural comparison. Practical interpretation does not establish suitability.
- Octanoic Acid · identity (opens new tab)
Related identity and structural relationship.
- Pentanoic Acid · identity (opens new tab)
Related identity and structural relationship.
- Nonanoic Acid · identity (opens new tab)
Related identity and structural relationship.
- Hexanoic Acid · dissociation references (opens new tab)
Only independently reviewed values are promoted into the comparison; no condition-free acidity ranking.
- OpenStax · Carboxylic-acid structure and properties (opens new tab)
General carboxylate resonance, acidity and structural interpretation; not authority for this acid’s quantitative constants.
- NIST · phase-change data (opens new tab)
Compiled fusion and boiling data; original references and uncertainties retained.
- PubChem / HSDB · attributed physical references (opens new tab)
Individual references reviewed; numerical fields selected or omitted with conditions and conflict dispositions.
Review limits
pKa: CONFLICT UNRESOLVED. HSDB cites 4.4, 4.893 and 4.8 at 25 °C to different references. Same acid; conditions and methods insufficient to explain spread. Omitted from the main pKa field and comparisons. Melting reference: CONDITION-DEPENDENT. NIST includes older fusion measurements with larger uncertainties and a distinct triple point. Selected individual fusion result is labelled by source and uncertainty; no purity-based explanation for supplier differences is asserted.
This informational prototype is not a supplier, quotation service, or endorsement of a product’s fitness for an application. Buyers should verify the applicable specification, certification, and regulatory requirements for their intended use.