A highly active Zn(salphen) catalyst for production of organic carbonates in a green CO2 medium

Zn(salphen), in combination with Bu4NI, was studied as a binary catalyst system for CO2-fixation
in the context of organic carbonate formation. The catalytic potential of this binary catalyst
system was considerably improved by working in a solvent-free, CO2-rich environment, thereby
increasing the overall contact between the reagents and catalyst. Under these green conditions,
excellent conversion and selectivity towards the cyclic carbonate product were obtained with
epoxides that are generally less prone to undergo cycloaddition with carbon dioxide. The effect of
the reaction conditions and the type of co-catalyst employed together with Zn(salphen) were
systematically investigated and optimised.

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