CATALYTIC EPOXIDATION OF CICLOHEXENE WITH ETHYLBENZENE HYDROPEROXIDE USING MOLYBDENUM HETEROGENEOUS CATALYST

摘要

Epoxides are chemical compounds of great importance asnintermediate products in the preparation of a wide variety of chemicalnproducts ranging from petrochemical compounds to fine chemicalsn[1]. Despite numerous reports in the literature, the epoxidation ofnterminal alkenes remains a challenge. Many different methods havenbeen developed for the preparation of epoxides, but the mostnextended technology is the epoxidation of olefins withnhydroperoxides in the presence of catalysts [1]. The active center ofnthese catalysts is a transition metal in a high oxidation state withnLewis acidity, such as: Mo(IV), Ti(IV), V(V), W(IV)...[2, 3] At bothnindustrial and laboratory scale, molybdenum based catalysts showednthe highest performance in the epoxidation of alkenes with organicnhydroperoxides. It is well known that the selectivity to epoxidendepends on several factors such as the ligand nature, the oxidationnstate or the Lewis acidity of the metal center