Propargyl-PEG2-Ms | CAS 943726-01-0

Propargyl-PEG2-Ms is a PEG-based click chemistry reagent featuring a terminal propargyl group for copper-catalyzed azide–alkyne cycloaddition (CuAAC) and a mesylate leaving group for efficient nucleophile substitution. The short, flexible PEG spacer supports aqueous compatibility and reduces steric constraints during surface or biomolecule functionalization. This combination makes Propargyl-PEG2-Ms a practical intermediate for building clickable linkers, preparing functional materials, and generating reactive handles for downstream conjugation workflows used in chemical biology and materials science.

1. Linker For Bioconjugation

Propargyl-PEG2-Ms is commonly used to introduce a clickable alkyne handle onto biomolecule scaffolds and polymeric carriers through mesylate-driven substitution with amine or other nucleophiles. Researchers use the PEG spacer to improve solubility and to help preserve accessibility of the propargyl group for subsequent CuAAC labeling steps. The resulting alkyne-functional conjugates are then paired with azide-bearing partners to assemble imaging probes, affinity reagents, or multicomponent research constructs with controlled attachment geometry.

2. Surface Functionalization Chemistry

Propargyl-PEG2-Ms supports the preparation of alkyne-functional surfaces and coatings by reacting the mesylate group with nucleophilic groups present on material surfaces, such as amine-terminated substrates or polymer films. The PEG2 segment helps mitigate non-specific interactions and can enhance uniformity of functional layer formation, while the terminal propargyl group provides a robust entry point for CuAAC patterning. This makes Propargyl-PEG2-Ms valuable in workflows where researchers need spatially addressable clickable motifs for materials characterization, assay development, or surface-based capture systems.

3. Molecular Imaging Probe Building

Propargyl-PEG2-Ms is used as a linker component in the assembly of alkyne-containing imaging and detection reagents, where a PEG spacer is beneficial for balancing solubility and probe accessibility. After installing the alkyne functionality onto a targeting or reporting scaffold via the mesylate reactive handle, the propargyl group enables rapid CuAAC coupling to azide-functional dyes, reporters, or complementary imaging moieties. Such modular probe construction is widely adopted in molecular imaging research tool development to streamline iterative synthesis of probe variants.

4. Diagnostics And Assay Reagents

Propargyl-PEG2-Ms is frequently incorporated into reagent pipelines for generating clickable assay components, including alkyne-functional affinity reagents, labeling reagents, and multiplexing standards. The mesylate functionality enables attachment to nucleophile-bearing building blocks, while the terminal alkyne supports subsequent conjugation to azide-tagged detection elements. This approach is particularly useful for constructing consistent conjugation chemistries across reagent libraries, enabling researchers to rapidly swap labels or detection chemotypes while maintaining a common clickable interface.