Diethyl oxalate, CAS 95-92-1, is an oxalate ester used as a synthesis intermediate and, in selected processes, as a solvent or formulation component. Public substance records identify it as C6H10O4 with a molecular weight of 146.14 g/mol. Those identity facts are useful, but they do not tell a buyer whether a commercial grade will perform consistently in a specific reaction. That decision requires a closer look at reaction role, impurity sensitivity, handling conditions and downstream purification.
Begin with the reaction role
Before requesting a quotation, define what diethyl oxalate is expected to do in the process. In synthesis it may provide an oxalyl-derived carbon framework or participate in condensation and related transformations. In other settings it may be evaluated as an organic process medium. The correct purchasing specification depends on that role. A process using it as a stoichiometric intermediate may place more emphasis on assay and reactive impurities, while a process using it as a medium may focus more heavily on water, color, residue and distillation behavior.
Applications should be stated precisely
Commercial literature often groups diethyl oxalate under pharmaceutical, agrochemical, dye, fragrance, resin and fine-chemical applications. These are useful market categories, but they are not a substitute for the buyer’s actual process definition. Buyers should identify the target intermediate or process stage, expected consumption, recovery strategy and quality risk. Suppliers should avoid claiming that one industrial grade is automatically suitable for every regulated or high-purity application.
Impurities can affect process economics
A headline purity value is only the starting point. Water may influence moisture-sensitive reactions and storage stability. Acidity can affect catalyst demand, corrosion risk or downstream neutralization. Color may matter when the final product has strict appearance requirements. Nonvolatile residue and related organic impurities can influence purification load and yield. The relevance of each parameter depends on the chemistry, so the buyer should rank critical attributes rather than copying a generic specification.
Questions for process and procurement teams
- Is diethyl oxalate a reactant, intermediate feed or process medium?
- Which impurity limits have a demonstrated effect on yield or product quality?
- Is a standard industrial grade sufficient, or is a tighter customer specification required?
- Will the material be charged directly, dried, filtered or distilled before use?
- What batch size and packaging format fit the receiving and charging system?
- Does the destination require specific registration, labeling or transport documentation?
Evaluate a supplier with batch evidence
Ask for a representative specification and a recent batch COA. Compare analytical methods as well as numerical limits, because two suppliers may report similar-looking results using different procedures. A trial sample can be useful when the process is sensitive, but the sample should represent the proposed commercial grade. Scale-up planning should also consider package opening, transfer, moisture exposure and the time material remains in storage.
Build the request around the actual use
A useful inquiry states CAS 95-92-1, target purity, critical impurity limits, annual or trial quantity, destination, package preference and intended application. This gives the supplier enough information to confirm feasibility without guessing. Review the Xinchen Diethyl Oxalate product page for the current commercial description and quotation route.
Reference sources
Identity information can be checked in PubChem CID 7268 and the ECHA substance record. Final application approval, specification and handling decisions must be based on the current supplier documents, batch data and the buyer’s own process assessment.
Deeper review of applications and process fit
Diethyl oxalate, CAS 95-92-1, is an oxalate ester used as an intermediate in selected organic synthesis routes. Application descriptions do not establish fit for every reaction. Assay, moisture, acidity, appearance and impurity profile should be connected to the receiving process and written purchase specification.
| Review point | Buyer action |
|---|---|
| identity and assay | Define the requirement, review the method and confirm the shipping-batch result. |
| moisture and acidity | Define the requirement, review the method and confirm the shipping-batch result. |
| appearance and colour | Define the requirement, review the method and confirm the shipping-batch result. |
| reaction conversion and by-product profile | Define the requirement, review the method and confirm the shipping-batch result. |
| sample qualification under the buyer’s process | Define the requirement, review the method and confirm the shipping-batch result. |
For a new source, request a current specification, representative COA and SDS, then test a sample by the receiving laboratory. Where reaction performance matters, document conversion, selectivity, colour and downstream purification during a controlled trial. The shipping-batch COA should be reviewed again before release.
Commercial and export checklist
- Confirm the identity, CAS number and offered grade.
- Provide the target limits, quantity and application.
- Agree package type, net weight and sampling expectations.
- Review transport classification and destination requirements from current documents.
- Confirm batch traceability, labels and required export paperwork.
Price comparisons should use the same grade, package, net weight, Incoterm and documentation basis. A low quotation can become more expensive if re-testing, repacking, port delay or process variation is not considered.
Batch variation and non-conformance questions
Before regular supply begins, agree how specification changes, atypical results and package damage will be communicated. A useful quality agreement identifies who reviews deviations, whether replacement samples are retained, which laboratory method controls a disputed result, and what evidence is required before a batch can be released or rejected. This avoids making decisions from photographs or informal messages alone.
Frequently asked questions
Does 99% or 99.5% purity define the complete grade?
No. The purchase specification may also need limits for moisture, acidity, appearance and relevant impurities.
Should buyers request a production-plant cost or a current quotation?
Plant investment figures do not establish the delivered product price. Request a current quotation based on grade, quantity, packaging, destination, Incoterm and documentation.
Can the first commercial batch replace sample approval?
A representative sample and controlled trial reduce risk. The shipping batch should still be checked against its own COA and receiving procedure.
Product page and references
Review the Diethyl Oxalate product page and send the required specification, quantity, package and destination for quotation.
Use the current SDS, official records and destination rules for actual safety and compliance decisions.