Process for producing 5,6-dihydro-1,3-oxazines

摘要

PCT No. PCT/EP96/01954 Sec. 371 Date Nov. 14, 1997 Sec. 102(e) Date Nov. 14, 1997 PCT Filed May 9, 1996 PCT Pub. No. WO96/37484 PCT Pub. Date Nov. 28, 1996There has been found a new process for the preparation of 5,6-dihydro-1,3-oxazines, some of which are known, of the formula (I) (I) in which A represents substituted phenyl, or represents in each case optionally substituted naphthyl, pyridyl, thienyl or pyrazolyl, and B represents hydrogen, alkyl, alkoxyalkyl, alkylthioalkyl, halogenoalkyl, alkenyl, optionally substituted cycloalkyl, or in each case optionally substituted phenyl, phenylalkyl, phenylalkenyl, phenoxyalkyl, phenylthioalkyl, pyridyl or 2- or 3-pyrrolyl by reacting amide derivatives of the formula (II) (II) with ethylene in the presence of hydrogen chloride gas and of a catalyst. The new 5,6-dihydro-1,3-oxazines can be used for combatting animal pests.