**3.6 Gadolinium based metal: organic framework as an efficient and heterogeneous catalyst to activate epoxides for cycloaddition of CO2 and alcoholysis**

Improvement of heterogeneous impetuses for the cycloaddition of CO2 with epoxides to get ready cyclic carbonates is a hotly debated issue in the field of CO2 change. Thus, an uncommon earth-metal gadolinium-based metal–natural system (Gd-MOF) was blended from GdCl3 and pyromellitic dianhydride in *N, N*-dimethylformamide, which was portrayed by powder X-beam diffraction (XRD), filtering electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption, and Fourier change infrared (FT-IR) spectroscopy. The combined Gd-MOF could be utilized as heterogeneous impetus for the cycloaddition of CO2 with epoxides within the sight of quaternary ammonium salts, and Gd-MOF/n-Bu4NBr demonstrated the best execution for the cycloaddition of CO2 with different epoxides to frame the relating cyclic carbonates because of the incredible synergetic impact. Moreover, the readied Gd-MOF could be utilized as heterogeneous impetus for alcoholysis of different epoxides to frame *β*-alkoxy alcohols successfully [20].
