[CH2:1]([CH:5]1[CH2:8][C:7]([C:9]([OH:11])=[O:10])=[CH:6]1)[CH:2]([CH3:4])[CH3:3]>[Rh].O1CCCC1>[CH2:1]([CH:5]1[CH2:6][CH:7]([C:9]([OH:11])=[O:10])[CH2:8]1)[CH:2]([CH3:4])[CH3:3]3-Isobutyl-1-cyclobutenecarboxylic acid (188 g) and tetrahydrofuran (2000 mL) were mixed. To the mixture was added 5 w/w % rhodium on activated carbon (5.64 g). The resulting mixture was stirred at RT for 7 hr under hydrogen atmosphere (1 atm). The 5 w/w % rhodium on activated carbon was filtered off and the filtrate was concentrated in vacuo to give the title compound (134.06 g) as a crude product.
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