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.