1,2-Bis(2-iodoethoxy)ethane

This bifunctional linker, 1,2-Bis(2-iodoethoxy)ethane, is designed to enable efficient assembly of targeted protein degradation (PROTAC) constructs by providing two chemically addressable alkyl halide termini for stepwise conjugation. Its ether-rich scaffold offers conformational flexibility while maintaining reactivity toward nucleophilic substitution. The molecule is therefore well suited for researchers seeking modular linker installation strategies, with the subsequent sections describing its structure and practical reactivity considerations in PROTAC synthesis.

Structure: The linker comprises an ethane core bearing two ether-linked two-carbon arms terminated by iodides. It contains ether linkages and C–I bonds, providing a flexible, polarizable framework that supports solubility and controlled spacing between conjugation handles.

Reactivity: The iodide termini participate in nucleophilic substitution reactions, enabling formation of C–C or C–heteroatom connections when paired with appropriate nucleophiles such as deprotonated amines, thiolates, or phenoxides. PROTAC linker construction typically uses inert atmosphere conditions, polar aprotic solvents, and base-promoted activation to drive alkylation. Reaction progress is commonly monitored by chromatographic methods to ensure selective mono- versus bis-functional coupling.