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An approach is described in which this unit is modified to incorporate a carboxylic ester with the goal of enabling the use of mild depolymerisation conditions. Inspired by preliminary results using a Cu\/TEMPO\/O<jats:sub>2<\/jats:sub> system, a protocol was developed that gave the desired \u03b2\u2010<jats:italic>O<\/jats:italic>\u20104\u2010containing ester in high yield using certain dimeric model compounds. The optimised reaction conditions were then applied to an oligomeric lignin model system. Extensive 2D NMR analysis demonstrated that analogous chemistry could be achieved with the oligomeric substrate. Mild depolymerisation of the ester\u2010containing oligomer delivered the expected aryl acid monomer.<\/jats:p>","DOI":"10.1002\/chem.202000088","type":"journal-article","created":{"date-parts":[[2020,5,7]],"date-time":"2020-05-07T07:32:26Z","timestamp":1588836746000},"page":"12397-12402","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Copper\u2010Mediated Conversion of Complex Ethers to Esters: Enabling Biopolymer Depolymerisation under Mild Conditions"],"prefix":"10.1002","volume":"26","author":[{"given":"Ganyuan","family":"Xiao","sequence":"first","affiliation":[{"name":"School of Chemistry and Biomedical Sciences Research Complex University of St Andrews and EaStChem  North Haugh St Andrews Fife KY16 9ST UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James R. 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