3,6,9,12,15,18,21,24,27,30-Decaoxahentriacontanoic acid is a long-chain, poly(ethylene glycol)–like aliphatic linker bearing a terminal carboxylic acid, providing a flexible, hydrophilic spacer suitable for PROTAC assembly. Its repeating ether units confer conformational adaptability and aqueous solubility, while the carboxylate handle enables robust amide coupling or other conjugation strategies to connect an E3-ligand moiety and a target-binding ligand. In PROTAC designs, such ether-rich linkers help tune the effective distance and relative orientation between the recruited E3 ligase and the target protein, often improving ternary complex formation and thereby influencing degradation potency and selectivity. As a modular building block, this linker supports systematic structure–activity relationship studies, including linker-length and polarity optimization, and can be used to generate degraders with reduced steric constraints and enhanced physicochemical compatibility for in vitro biochemical and cellular assays.
Structure of 405518-55-0
* For research and manufacturing use only. Not for human or clinical use.
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3,6,9,12,15,18,21,24,27,30-Decaoxahentriacontanoic acid, provides a long, flexible polyether scaffold terminating in a carboxylic acid for efficient conjugation to targeting and E3 ligase-binding modules. Its ether-rich chain supports solubility and conformational adaptability, which can help tune linker length and presentation of functional groups in targeted protein degradation workflows. The detailed structural and synthetic considerations are provided below.
Structure: The linker is a polyether carboxylic acid featuring a repeating ethylene-oxide motif that imparts high flexibility and polarity. It contains multiple ether linkages along an extended aliphatic backbone and a terminal carboxyl group suitable for amide or ester formation.
Reactivity: The carboxylic acid enables standard PROTAC assembly via activation to form amide bonds with amine-bearing ligands or via ester intermediates for subsequent transformations. Common approaches include carbodiimide-mediated coupling, often paired with coupling additives, using polar aprotic solvents under conditions that minimize side reactions. Mechanistically, activation of the acid generates a reactive ester-like intermediate that undergoes nucleophilic attack by the partner amine to yield stable amide-linked constructs.
* Our calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
It is commonly abbreviated as: C1V1 = C2V2
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