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Single\u2010molecule junctions have emerged recently as the ultimately scaled down system, operating in the quantum realm. Several strategies have been developed to impart mechanoresistivity to a molecular junction, but all these require structural modifications to the conducting backbone, to introduce either short\u2010circuiting anchoring points to the electrode or conformationally flexible moieties. Here, we show a synthetically accessible way to impart mechanoresistivity, by adding silyl\u2010protected ethynyl functional groups that extend the \u03c0\u2010system orthogonally to the transport axis. Junctions fabricated with ethynyl\u2010extended acenes demonstrate strong and reproducible mechanoresistivity, with log\u2010linear dependence of conductance on displacement and large amplitude (&gt; 10\n                    <jats:sup>2<\/jats:sup>\n                    \u2005per nanometer). Analytical and density functional modeling demonstrate that the compressed junctions are better coupled to the electrodes, due to overlap between the extended \u03c0\u2010system and the density of states of the Au electrodes. As ethynyl moieties are trivial to attach to a variety of substrates, we expect this strategy to be widely applicable as a synthetically advantageous way to impart mechanoresistivity to a wide variety of molecular wires.\n                  <\/jats:p>","DOI":"10.1002\/smll.76128","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T11:11:12Z","timestamp":1791285072000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ethynyl Substituents as Rheostatic Triggers in Single\u2010Molecule Junctions"],"prefix":"10.1002","author":[{"given":"R. Tom","family":"Abram","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lewis","family":"Hamilton","sequence":"additional","affiliation":[{"name":"Device Modelling Group School of Engineering University of Warwick  Coventry UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amit","family":"Sil","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James H. 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