Catalyst development for the synthesis of ozonides and tetraoxanes under heterogeneous conditions. Disclosure of an unprecedented class of fungicides for agricultural application.

The catalyst H 3+x PMo 12-x +6 Mo x +5 O 40 supported on SiO 2 was developed for peroxidation of 1,3- and 1,5-diketones with hydrogen peroxide with the formation of bridged 1,2,4,5-tetraoxanes and bridged 1,2,4-trioxolanes (ozonides) with high yield based on isolated product (up to 86 and 90% respectively) under heterogeneous conditions. Synthesis of peroxides under heterogeneous conditions is a rare process and represents a challenge for this field of chemistry, because on a surface of the catalyst peroxides tend to decompose. A new class of antifungal agents for crop protection, cyclic peroxides: bridged 1,2,4,5-tetraoxanes and bridged ozonides, was discovered. Some ozonides and tetraoxanes exhibit a very high antifungal activity and are superior to commercial agro fungicides such as Triadimefon and Kresoxim-methyl. It is important to note that none of the agro fungicides used in agricultural chemistry contains peroxide fragment.