undecanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) <=> trans-2-undecenoyl-CoA + reduced [electron-transfer flavoprotein]
undecanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+) <=> trans-2-undecenoyl-coa + reduced [electron-transfer flavoprotein]