1,2-Bis(2-propynyloxy)ethane | CAS 40842-04-4

1,2-Bis(2-propynyloxy)ethane is a bifunctional alkyne building block featuring two propargyl ether groups installed on a short ethylene linker. As a click chemistry reagent, it is commonly used in copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) workflows to introduce two terminal alkynes for rapid, modular coupling. The compact, symmetrical structure supports multivalent labeling and crosslinking strategies in materials and chemical biology, where controlled attachment of biomolecules, polymers, or surfaces via azide partners is required.

1. Multivalent Probe Conjugation

1,2-Bis(2-propynyloxy)ethane is widely used to generate multivalent click handles for constructing higher-avidity chemical probes and reagent platforms. Researchers employ it as a linker to connect azide-functional targeting ligands, affinity tags, or reporter modules to alkyne-bearing scaffolds while enabling two coupling sites per molecule. This makes it particularly useful when probe performance depends on spacing and stoichiometry, such as in fluorescence labeling toolkits, affinity capture reagents, and library-style synthesis of modular detection constructs.

2. Polymer and Hydrogel Crosslinking

1,2-Bis(2-propynyloxy)ethane supports click-based network formation where azide-functional polymers or hydrogel precursors are crosslinked through CuAAC to install alkyne-derived junctions. The bifunctional nature enables formation of extended architectures rather than single-point attachments, which is valuable for tuning gelation behavior, mesh size, and material robustness in research-grade biomaterials workflows. Common downstream uses include preparing functional hydrogels for controlled presentation of bioactive motifs, building block polymers for surface coatings, and azide/alkyne patterned materials used in cell-interaction studies and assay development.

3. Surface Functionalization and Patterning

1,2-Bis(2-propynyloxy)ethane is used in surface chemistry to introduce alkyne functionality for subsequent azide-driven coupling onto substrates such as glass, polymer films, and microfabricated platforms. Because it carries two propargyl ether termini, it can improve surface coverage and enable more uniform multivalent attachment compared with monofunctional alkynes, supporting robust immobilization of capture reagents and labeling chemistry. This application is common in workflows for preparing assay surfaces, immobilized affinity materials, and patterned chemical interfaces for imaging and analytical tool development.

4. DNA/RNA and Biomolecular Labeling

1,2-Bis(2-propynyloxy)ethane is frequently incorporated into labeling strategies for nucleic acid and biomolecule conjugates that rely on azide–alkyne click coupling. It provides a convenient way to install two alkyne groups for subsequent attachment of azide-modified oligonucleotides, peptide tags, or other biomolecular components, supporting multivalent labeling designs used in chemical biology and molecular imaging reagent development. The reagent’s ether-linked propargyl groups are well suited to modular assembly of fluorescent, affinity, or enrichment constructs used in analytical workflows and research assays.