Isoamyl 4-Hydroxybenzoate is the isoamyl (3-methylbutyl) ester of 4-hydroxybenzoic acid, a member of the paraben family that carries a branched alkyl chain rather than a straight one. In the laboratory it serves as an analytical reference material, as a test compound in preservative research, and as a non-heterocyclic building block in organic synthesis. Its availability matters because many studies require a direct comparison between branched and straight-chain esters of equivalent carbon count, so that the influence of molecular shape on physical properties and biological activity can be separated from the influence of chain length alone.
The characteristic that makes this compound a preferred choice lies in the branching of its alkyl chain. Branching changes the way the molecule occupies space, which affects packing density in the solid phase, solubility across different solvents, and the manner in which the molecule interacts with chromatographic column surfaces. As a result, the retention time of the isoamyl ester often differs from that of its straight-chain isomer even though the number of carbon atoms is identical, and that difference becomes valuable information during method development. The phenolic hydroxyl group at the para position continues to provide ultraviolet absorption, which supports detection in routine analytical work.
In Indonesian laboratories, the material is typically encountered in analytical chemistry units, quality control facilities, and academic research groups working on preservative systems and structure-property relationships. It is handled as a reference substance in method development and validation exercises, and as a starting material in small-scale organic synthesis. Its role in comparative studies of paraben homologues makes it a practical addition to laboratories that maintain a working set of ester standards for chromatographic identification and confirmation work.
- Analytical reference standard: the compound provides a defined comparison point for identifying and confirming isoamyl 4-hydroxybenzoate in chromatographic separations, supported by ultraviolet absorption from its phenolic hydroxyl group.
- Chromatographic method development: because the branched chain shifts retention behaviour relative to the straight-chain isomer, this material helps analysts establish separation conditions that resolve closely related paraben esters.
- Preservative research: as a test compound within the paraben family, it allows researchers to examine how a branched alkyl substituent influences behaviour compared with conventional linear-chain preservative esters of the same carbon count.
- Structure-property investigations: the material supports studies that isolate the effect of molecular shape on solid-phase packing density and solubility, separating shape effects from the simple influence of chain length.
- Non-heterocyclic building block: the reactive phenolic hydroxyl and ester functionality make this compound a practical starting point for further transformations in small-scale organic synthesis work.
| Brand | TCI |
|---|---|
| CAS number | 6521-30-8 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Building Blocks > Non-Heterocyclic Building Blocks |
| Pack sizes | available in standard laboratory pack sizes as supplied by the manufacturer |
| Physical form | — |
| Storage | store according to the conditions stated on the manufacturer's label and safety data sheet |
- Catalogue number: H0214
Store the container tightly closed in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and incompatible materials, following the storage conditions given on the manufacturer's label and safety data sheet. Keep the material in its original container or in a chemically compatible, clearly labelled alternative such as amber glass, and reseal it promptly after each use to limit exposure to moisture and air. Handle the compound in a fume hood or other well-ventilated workspace, wearing a laboratory coat, safety glasses, and suitable chemical-resistant gloves. Avoid generating dust, avoid contact with skin and eyes, and wash hands thoroughly after handling. Weigh and transfer the material using clean, dry equipment to prevent contamination of the stock, and consult the safety data sheet before first use and before any disposal of residues or empty containers.
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