Methyltetrazine-PEG12-t-butyl ester | CAS 2183440-38-0

Methyltetrazine-PEG12-t-butyl ester is a PEGylated methyltetrazine click chemistry reagent designed for bioorthogonal inverse-electron-demand Diels–Alder (IEDDA) ligation. The structure couples a reactive methyltetrazine handle to a long, hydrophilic PEG spacer and a t-butyl ester that supports convenient formulation and downstream conjugation workflows. This combination is widely used in chemical biology and molecular imaging research where stable, water-compatible tetrazine-bearing probes are required for labeling biomolecules, surfaces, and materials with high selectivity.

1. Bioorthogonal Probe Labeling

Methyltetrazine-PEG12-t-butyl ester is commonly employed as the tetrazine component for IEDDA-based labeling of biomolecules and probe constructs in chemical biology workflows. Researchers use the PEG spacer to improve solubility and reduce nonspecific interactions during labeling of proteins, peptides, and nucleic-acid-associated assemblies, particularly when working in complex buffers. The reagent format supports preparation of tetrazine-functional probe stocks that can be paired with strained alkene or trans-cyclooctene partners to generate stable conjugates for microscopy, flow-based assays, and mechanistic studies of biomolecular interactions.

2. Molecular Imaging Conjugates

Methyltetrazine-PEG12-t-butyl ester is frequently selected for building molecular imaging and visualization reagents where tetrazine handles enable rapid, selective attachment to imaging scaffolds. The PEG12 linker helps maintain colloidal stability and minimizes aggregation when conjugates are prepared for fluorescence-based labeling, enrichment strategies, or multimodal probe development. In imaging reagent pipelines, the t-butyl ester motif is often leveraged to support controlled handling and conjugation steps prior to final assembly of the imaging conjugate, enabling consistent probe preparation for comparative studies across targets and labeling densities.

3. Surface And Material Functionalization

Methyltetrazine-PEG12-t-butyl ester is well suited for functionalizing material surfaces and biomaterials that require bioorthogonal coupling to introduce tetrazine-reactive chemistry. The PEG spacer promotes uniform presentation of reactive groups on hydrophilic surfaces, improving accessibility for subsequent IEDDA ligation with complementary strained-alkene reagents. This makes the reagent useful in workflows that generate clickable coatings, hydrogel-linked constructs, and assay-ready material platforms where spatially controlled labeling and reduced background binding are important for reproducible downstream readouts.

4. Targeting Ligand Conjugation

Methyltetrazine-PEG12-t-butyl ester is used to prepare tetrazine-bearing targeting ligands and ligand-adjacent components for modular conjugation strategies. In research and diagnostics reagent development, the reagent supports assembly of multicomponent constructs by enabling orthogonal coupling to strained-alkene partners, allowing researchers to tune the architecture of ligand–cargo assemblies without relying on harsh conditions. The PEG12 chain helps preserve ligand accessibility and improves handling during conjugate formulation, supporting consistent synthesis of clickable targeting platforms for labeling, enrichment, and analytical studies.