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A selective hydrogenation of maleic anhydride to either gamma-butyrolactone or succinic anhydride over simple Pd/Al2O3 catalyst under supercritical CO2 medium is described for the first time which has considerable promise for both lab-scale as well as industrial selective hydrogenations of low vapor pressure compounds without employing environmentally harmful organic solvents.
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Pillai et al. (2002) studied this question.
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