Isobutyric Acid → 2,2,4,4-Tetramethylcyclobutane-1,3-diol

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A solution of 18.0 wt % 2,2,4,4-tetramethylcyclobutane-1,3-dione and 3.90 wt % isobutyric acid in isobutyl isobutyrate was added to the reactor system containing 405 mL of a 2 wt % Ru-0.5 wt % Re-0.025 wt % Sn on alumina catalyst at a rate of 20 mL/min. The pressure at the top of the reactor was maintained at 500 psig and the temperature at the top of the catalyst bed was 128° C. These conditions were maintained for 24 hours. The average conversion of the dione was 98.4%. 2,2,4,4-Tetramethylcyclobutane-1,3-diol (16.5 wt %) was obtained at a rate of 24.8 lb/ft3 catalyst/hr (3.50 mmol/g/hr). The average conversion of isobutyric acid was 44.4% (0.592 mmol/g-hr).

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