“…Noyori and co‐workers reported that the isomerizations of α,β‐epoxy ketones in the presence of Pd(PPh 3 ) 4 are very sluggish even at 140 °C, but are strongly improved through the addition of bidentate phosphane ligands, especially dppe, leading to β‐diketones [Equations (32) and (33)] 56,57. The procedure has been used for the efficient isomerization of 2,6,6‐trimethyl‐1‐oxo‐2,3‐epoxycyclohexane58 and 4‐ tert ‐butyldimethylsilyloxy‐1‐oxo‐2,3‐epoxycyclopentane,59 but was ineffective with methyl 1‐ethyl‐2‐oxo‐3,4‐epoxycyclohexane‐1‐propanoate as the substrate 60.…”