CYCLIC ACETALS, THEIR PREPARATION AND THEIR CONVERSION TO CROP PROTECTION AGENTS

摘要

Cyclic acetals, their preparation and their conversion to crop protection agents Cyclic acetals of the formula I <IMG> I where the substituents have the following meanings: R1 and R2 are hydrogen, unsubstituted or substituted alkyl or phenyl; additionally R1 and R2 together are an unsubstituted or substituted C2-C6-alkylene chain; Y is oxygen or sulfur; A is a radical A1 to A6; A1 is hydroxyl; A2 is a halogen atom, haloalkylsulfonyloxy, alkylsulfonyloxy or fluorosulfonyloxy; A3 is cyano, nitro or formyl; A4 is a phenyl ring or a 5- or 6-membered saturated or unsaturated heterocycle having up to four heteroatoms from the group consisting of nitrogen, sulfur and oxygen in the ring; naphthyl or a benzo-fused 5- or 6-membered heteroaromatic having 1 to 3 heteroatoms from the group consisting of nitrogen, sulfur and oxygen; A5 is an alkenyl, cycloalkenyl, cycloalkadienyl or alkynyl group; A6 is an alkyl or cycloalkyl group; where the radicals A4, A5 or A6 can be substituted; with the proviso that A is not a hydroxyl group if R1 and R2 are both hydrogen or if R1 is hydrogen and R2 is phenyl; a process for preparing the acetals I and their use for the production of crop protection compositions are described.