CuCl2@Poly-IL catalyzed carboxylation of terminal alkynes through CO2 utilization

- Preparation of Poly-GLY(mim)3(OMs)3.
- Synthesis of Cu@Poly-GLY(mim)3(OMs)3 catalyst.
- Efficient carboxylation of terminal alkyne.
- Catalyst able to reuse for four times.

The carboxylation of terminal alkynes from CO2 is a most attractive route in green chemistry point of view. Herein, we synthesized a novel CuCl2@Poly-GLY(1-Vim)3(OMs)3 catalyst and employed to the efficient carboxylation of terminal alkynes (phenyl carboxylate esters) by utilizing CO2 under 4 MPa, at 40 °C. In presence of catalyst, various terminal alkynes found to be easily reacting with CO2 and organic halide to affording a high yield of carboxylic ester. Moreover, CuCl2@Poly-GLY(1-vim)3(OMs)3 catalyst is capable to obtain a high yield of corresponding carboxylic ester using various types organic halide. Furthermore, CuCl2@Poly-GLY(1-vim)3(OMs)3 catalyst able to easily recover and reuse for four times without any obvious loss in catalytic activity. The catalytic reactivity of CuCl2@Poly-GLY(1-vim)3(OMs)3 catalyst is explained on the basis of predicted mechanism.

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