Process for preparing glycide by epoxidation using polymeric organosiloxane ammonium salts of oxoacids of the elements V, Nb, Ta, Mo, and W

摘要

The invention relates to polymeric organosiloxane ammonium salts having a silica-like skeleton and including units of Formula (I): (* CHEMICAL STRUCTURE *) (I) wherein R1 and R2 are identical or different and signify a group of Formula (II): (* CHEMICAL STRUCTURE *) (II) wherein R5 is an alkylene group and the oxygen atoms are saturated by silicon atoms of additional groups corresponding to Formula (II), optionally with the insertion of cross-linking agents; R3 represents groups corresponding to R1 or R2, or hydrogen or an alkyl group; R4 represents hydrogen or an alkyl group; x is the charge number of an oxo anion of a monooxo-, isopolyoxo- or heteropolyoxo acid of the elements vanadium, niobium, tantalum, molybdenum or tungsten; and oxo groups of the X anion also may be replaced by peroxo groups. The invention also includes methods of preparing the salts of Formula (I) from salts of the type (R1R2R3R4N+)yY wherein Y is different from X. The invention further includes the use of the salts of Formula (I) as catalyst for oxidation reactions using peroxo compounds as an oxidation agent.