A green, efficient, and selectivesynthesis of unsymmetricalorganiccarbonates is realised in the liquid phase by direct condensation of an alcohol and diethyl carbonate, in an eco-compatible route, in the presence of a recyclable heterogeneous solid-base CsF/α-Al2O3 catalyst. The catalyst displayed unprecedented activity after activation at 393 K for 4 h and produced quantitative yields with a greater