Add time:08/20/2019         Source:sciencedirect.com

The microwave-assisted partial hydrogenation of 2-Butyne-1,4-diol (cas 110-65-6), diphenylacetylene and phenylacetylene with novel lead-free Pd/Boehmite catalysts were investigated. Obtaining high alkyne conversion and good selectivity of the product alkenes required optimization of several reaction parameters: substrate concentration, amount of catalyst, temperature, hydrogen pressure, solvent and reaction scale. Dielectric heating strongly enhanced the conversion whilst maintaining good selectivity to alkenes (over 92%). Excellent 2-butyne-1,4-diol conversions, with 100% alkene selectivity, were achieved in water (20 mL) at 90 °C at high substrate concentrations (20 wt%).

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