Overview
trans-Cyclooctene (trans-COE) is a strained cyclic alkene with a trans double bond configuration, a rarity in medium-sized rings due to steric constraints. Its high ring strain (approx. 14 kcal/mol) makes it exceptionally reactive, particularly in cycloaddition reactions like the inverse electron-demand Diels-Alder (IEDDA) process. First synthesized in the mid-20th century, trans-COE gained prominence as a bioorthogonal reagent in click chemistry. Its ability to rapidly couple with tetrazines without catalysts enables applications in bioconjugation, material science, and pharmaceutical labeling.
Physical and Chemical Properties
As a liquid at room temperature, trans-cyclooctene has a characteristic hydrocarbon odor and low water solubility. The trans-configuration introduces significant torsional strain, evidenced by its higher energy compared to cis-cyclooctene (ΔH ≈ 11 kcal/mol). The double bond reacts readily with electrophiles and dienophiles. It undergoes [4+2] cycloadditions with tetrazines at rates up to 106 M−1s−1, among the fastest bioorthogonal reactions known. Stability varies with substitution; unsubstituted trans-COE may oligomerize at room temperature unless stabilized with inhibitors like BHT.
Main Applications
In bioconjugation, trans-COE-tetrazine ligation labels biomolecules (e.g., antibodies, glycans) for imaging and drug delivery. The reaction’s speed and selectivity allow live-cell labeling with minimal interference. Polymer chemists use it as a crosslinker to introduce degradable linkages via IEDDA. Specialty adhesives and self-healing materials leverage its strain-release reactivity. Pharmaceutical researchers employ it to construct PROTACs and prodrugs through bioorthogonal "click-and-release" strategies.
Safety and Storage
As a flammable liquid, trans-cyclooctene requires storage in flame-proof cabinets under nitrogen. Decomposition may release carbon monoxide upon heating. Suppliers often add stabilizers (0.1% BHT) to prevent polymerization. Handling necessitates nitrile gloves, goggles, and vapor control. Spills should be absorbed with inert materials (vermiculite) and disposed as hazardous waste. SDS guidelines recommend ventilation and grounding to prevent static discharge during transfer.
B2B Procurement Guide
Industrial buyers should verify analytical certificates (HPLC/NMR) confirming purity (>95% typical) and enantiomeric excess if applicable. Bulk orders (kg-scale) may require cold chain logistics due to thermal sensitivity. Supplier audits should assess ISO 9001 compliance and batch-to-batch consistency. Some vendors offer derivatives (e.g., PEGylated trans-COE) for enhanced solubility. MOQs often start at 1-10g for R&D use, with lead times of 2-4 weeks for custom syntheses.
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