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<正>The utilization of CO2 in the synthesis of high value-added fine chemicals has received much attention over the past decade,since CO2 can be used as an abundant,inexpensive and non-toxic renewable carbon resource.1Catalytic carboxylation of terminal alkynes with CO2 attracted considerable interest and is emerging as a powerful tool in the straightforward synthesis of functionalized propiolic acids and 2-alkynoates,2,3 which are versatile