**1. Introduction**

## **1.1. Epoxidation of allylic compounds, especially diallyl ether and allyl-glycidyl ether, and applications of allyl-glycidyl ether epoxidation product**

Research on the epoxidation of allylic compounds: propylene [1–5], allyl chloride [6–12], allyl alcohol [13–17], methallyl alcohol, crotyl alcohol, and 1-butene-3-ol [18] with hydrogen peroxide over the titanium silicate catalysts have been carried out for over 10 years. There are not many reports concerning the epoxidation of allyl-glycidyl ether (AGE) or diallyl ether

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(DAE) [19] with hydrogen peroxide over these catalysts. It can be caused by the fact that the epoxidation of AGE and DAE is very complicated, as in addition to the epoxidized ether derivatives, by-products formed by the decomposition of these ethers and their epoxidized derivatives, as well as products of further transformations of these decomposed products, i.e. glycidol and glycerol, are received. Moreover, during epoxidation, the epoxy rings may be opened and diols can be formed. However, due to numerous applications of diglycidyl ether – DGE (production of linear, branched, and cyclic oligoglycerols used in the production of surfactants, preparation of anti-arrhythmia agents, production of components of other pharmaceuticals and medicines, for example, cryptands, preparation of lubricating oil additives, and synthesis of aminoethers), the epoxidation of AGE with hydrogen peroxide over Ti-SBA-15 is very interesting and worth further examinations. The simultaneous utilization of Ti-SBA-15 and a low-cost, environment friendly oxidant - hydrogen peroxide in the epoxida‐ tion of AGE, makes this method of DGE production a modern and environment friendly as the only product of hydrogen peroxide transformation is water and Ti-SBA-15 can be easily recovered from reaction mixtures, recycled into the process, and regenerated if it loses its activity [20]. An additional advantage is this process can be carried out in an aqueous medium also.
