3,6,9,12-Tetraoxapentadec-14-ynoic acid | CAS 1694731-93-5

3,6,9,12-Tetraoxapentadec-14-ynoic acid is a functionalized alkyne-bearing building block designed for copper-free and copper-mediated click chemistry workflows, commonly used as a bioorthogonal handle for attaching biomolecules, polymers, and surfaces. Its ether-rich, polyethylene glycol-like chain architecture provides aqueous compatibility and spacing control, which is valuable when conjugates must maintain accessibility and reduce nonspecific interactions. As an alkyne carboxylic acid, it is frequently incorporated into linkers, imaging probes, and material-reactive constructs where downstream click conjugation enables modular assembly.

1. Alkyne-Functional Linkers

3,6,9,12-Tetraoxapentadec-14-ynoic acid is widely used to introduce an alkyne functionality into custom linker systems for bioconjugation and materials chemistry. Researchers commonly convert the carboxylic acid into activated derivatives (such as NHS esters or other coupling-ready forms) to couple the alkyne-bearing chain to amine-containing biomolecules, peptides, or polymer backbones, creating a stable intermediate for subsequent click-based assembly. The ether-rich scaffold helps maintain solubility during labeling workflows and provides a flexible spacer that can improve the presentation of the reactive alkyne group for efficient downstream conjugation.

2. Surface And Polymer Conjugation

3,6,9,12-Tetraoxapentadec-14-ynoic acid supports the fabrication of functional surfaces and polymer materials that require precise, modular attachment points. In materials research, the carboxylic acid handle enables coupling to aminated substrates, coating chemistries, or polymer platforms, generating alkyne-functional interfaces that can be patterned or decorated using azide-bearing partners through click chemistry. This approach is frequently adopted in surface functionalization for biosensor development, affinity reagent immobilization, and the construction of clickable polymer networks where controlled spacing and reduced aggregation are important for reproducible material behavior.

3. Molecular Imaging Probe Building

3,6,9,12-Tetraoxapentadec-14-ynoic acid is commonly employed as a linker component in molecular imaging and diagnostic reagent development, where an alkyne serves as a versatile conjugation handle for assembling probe architectures. Probe developers use the carboxylic acid to prepare conjugatable intermediates that can be attached to targeting ligands, scaffold molecules, or carrier systems, and then combined with azide-functional reporter moieties via click chemistry to generate final imaging constructs. The ether-rich chain can help tune hydrophilicity and reduce steric constraints, supporting consistent probe performance across labeling and purification steps.

4. Enzyme and Protein Labeling

3,6,9,12-Tetraoxapentadec-14-ynoic acid is used in chemical biology workflows to create alkyne-tagged proteins and enzyme conjugates for downstream click-based labeling strategies. Protein engineers and bioconjugation specialists typically incorporate the reagent through carboxyl-to-amine coupling or related derivatization, producing a defined alkyne-functional protein intermediate that can later be reacted with azide-containing dyes, affinity tags, or reporter groups. The flexible, oxygen-rich spacer is particularly useful when labeling requires the reactive group to remain accessible in complex protein environments, supporting robust conjugation during assay development and reagent optimization.