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Description
TCI D2619 2,4-Diethyl-1,5-pentanediol (CAS 57987-55-0) is a branched aliphatic diol that carries two primary hydroxyl groups at either end of its carbon chain, together with two ethyl substituents on the main chain. The product is supplied as a mixture of DL- and meso- forms, consistent with its intrinsic nature as a compound bearing two stereogenic centres. In the laboratory, difunctional diols of this kind serve as monomers, chain-extending agents, and starting materials for the synthesis of esters, ethers, and cyclic protecting groups, which is why they appear frequently in polymer chemistry research, resin formulation, and coating material development.
The characteristic that makes this material attractive is the presence of ethyl branching along its chain skeleton. That branching disrupts the regularity and crystallisation tendency of the resulting derivatives, so polyesters or polyurethanes prepared from it tend to be more flexible, more readily soluble, and to display a more workable viscosity than their straight-chain analogues. Both hydroxyl groups are primary, making them more reactive and less sterically hindered than secondary hydroxyls, so esterification, transesterification, and addition to isocyanates proceed efficiently. These combined properties give researchers a building block that reacts predictably at both ends while imparting useful physical behaviour to the final product.
In Indonesian laboratories, this diol is typically encountered in university and institutional research groups working on polymer synthesis, in R&D units developing resins, adhesives, and surface coatings, and in analytical or synthetic chemistry laboratories that require a well-defined difunctional intermediate. Supplied under the TCI brand within the Chemistry > Building Blocks > Non-Heterocyclic Building Blocks category, it fits both exploratory bench-scale work and the preparation of reference materials for method development.
Laboratory Applications
- Polyester synthesis — the two primary hydroxyl groups react cleanly with diacids or diesters, while the ethyl branches lower crystallinity and give softer, more soluble polyester products.
- Polyurethane preparation — as a diol chain extender it adds efficiently to isocyanates, and its branched backbone yields segments with greater flexibility than linear diol analogues.
- Resin and coating formulation — the diol contributes a difunctional, low-crystallinity building unit that helps keep formulated resins workable and improves the handling viscosity of coating systems.
- Cyclic protecting group chemistry — the 1,5-diol arrangement allows formation of cyclic acetal or ketal type protecting groups when masking carbonyl functionality during multi-step synthetic sequences.
- Ester and ether derivative synthesis — both terminal hydroxyls are accessible to esterification, transesterification, and etherification, making it a convenient starting material for preparing branched difunctional derivatives.
Specifications
- Brand: TCI (Tokyo Chemical Industry)
- CAS number: 57987-55-0
- Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
- Product code: D2619
- Composition: supplied as a mixture of DL- and meso- forms (two stereogenic centres)
- Pack sizes: available in standard TCI catalogue pack sizes; please confirm the size required when ordering
- Storage: keep in a tightly closed container in a cool, dry place away from moisture
Handling and Storage
Store the material in its original tightly closed container in a cool, dry, well-ventilated area, away from heat sources, direct sunlight, and incompatible reagents such as strong oxidising agents and isocyanates in storage. Because hydroxyl-bearing compounds readily take up atmospheric moisture, keep the container sealed between uses and, where dry conditions are needed for a reaction, transfer under an inert atmosphere. Handle in a fume hood using gloves, safety glasses, and a laboratory coat, avoiding contact with skin and eyes and inhalation of vapour or mist. Use clean, dry glass or chemically compatible plastic vessels for weighing and transfer, label all secondary containers clearly, and consult the manufacturer's Safety Data Sheet before first use and for waste disposal guidance.
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